Qi Men Hour Chart Fuyin and Fanyin: The Complete Guide

You are reading an hour chart and a palace seems empty. Or the stem you expect in one position appears in the opposite direction. These are not errors in your plotting. They are two of the most important patterns in Qi Men Dun Jia: fuyin and fanyin. Understanding what they mean, how they modify your reading, and what to do when you encounter them is what separates a beginner from someone who can read a chart with confidence. This guide covers both patterns in depth, with practical examples, common pitfalls, and clear guidance for your hour chart practice.

If you are new to hour chart readings, start with the Qi Men Hour Chart complete guide for the foundational system. This article assumes you know the basic structure of the nine palaces, the eight doors, the nine stars, and the eight deities. Here we focus on two patterns that change how you interpret everything else you see in the chart.

What Is Fuyin in the Hour Chart

Fuyin literally translates as “concealed” or “hidden” energy. In the context of a QMDJ hour chart, fuyin occurs when a palace contains no heavenly stem. The stem that should occupy that palace based on the chart’s construction is absent. What remains is an empty space where a key piece of information should be. This absence is itself information. It tells you that the energy of that palace is dormant, inactive, or not yet manifest.

Think of fuyin as a room with the lights off. The furniture is still there. The room still exists. But you cannot see what is inside until the lights turn on. In the same way, a fuyin palace tells you that the potential represented by that palace exists but is not currently active. Whether the lights come on depends on what happens next in the reading and whether other factors stimulate the palace.

Not every empty palace is fuyin. A palace can be empty because of the natural rotation of stems through the palaces. Fuyin specifically refers to the pattern where the ruling stem of a palace is absent, creating a void that affects the reading. You can learn more about void and empty palaces in the Void and Empty Palaces guide, which covers the broader topic. This article focuses on fuyin as it appears in the hour chart context specifically.

It is worth noting that fuyin is a completely normal occurrence in every hour chart. Because the QMDJ hour chart uses six heavenly stems distributed across nine palaces, three palaces will always be without stems. The question is not whether fuyin exists in your chart, but where it exists and whether it affects your ruling palace. When you first start reading charts, the presence of fuyin can feel alarming, as though something is missing or wrong. With practice, you learn to see it as a neutral indicator that simply tells you which areas of life are dormant during this particular two hour window.

How to Identify Fuyin in Your Plotting

Identifying fuyin requires you to plot the chart correctly first. The hour chart has several layers, and each layer rotates through the nine palaces on a schedule. When you finish plotting, you look at each palace and check whether a heavenly stem occupies it. If the palace that should contain the ruling stem is empty, that palace is in fuyin.

Here is the step by step process:

First, plot the hour chart using the correct solar time for your location. The accuracy of your reading depends on getting the time right. You can learn the full plotting method from the Solar Time Plotting guide. Once the chart is plotted, scan each of the nine palaces. In each palace, you should see a combination of door, star, deity, and stem. If the heavenly stem position in a palace is empty, mark that palace as fuyin.

Most hour charts will have at least one fuyin palace. The nine palaces cannot all be occupied by stems at the same time because there are six stems (in the hour chart system) rotating through nine positions. Three palaces will always be empty of stems. Which three depend on the hour and the day. The fuyin palaces are always the same three positions for any given chart, determined by the stem cycle for that day.

For beginners, here is a simple method to check for fuyin. After you have plotted your chart, look at each palace one by one starting from palace 1 (North) and moving clockwise through the grid. For each palace, ask yourself: is there a heavenly stem here? If the answer is no, that palace is in fuyin. Note it down. After checking all nine palaces, you should have exactly three fuyin palaces marked. If you have more or fewer than three, recheck your plotting for errors.

The three fuyin positions rotate based on the day stem. Each day, a different set of three palaces will be in fuyin. This means that a palace which is void today will be active tomorrow, and a palace which is active today will be void tomorrow. The rotation follows a predictable pattern that you can learn over time, but in practice, you simply check each chart individually rather than trying to memorize the rotation schedule.

What Fuyin Means for Your Reading

When a palace is in fuyin, the energy of that palace cannot be directly accessed or activated. The door, star, and deity in that palace are present, but without a stem to anchor them, their influence is muted. This has several practical implications depending on which palace is affected and what your question is about.

If the palace that corresponds to your question is in fuyin, the timing is not ideal for taking action in that area. The energy is present but dormant. You can think of it as a seed that has not germinated. The potential exists, but the conditions for growth are not met. In practice, this usually means you should wait or choose a different hour for your action.

If the fuyin palace is not directly related to your question, its effect is less significant. It tells you that the area represented by that palace is quiet during this hour. For example, if the wealth palace is in fuyin but your question is about relationships, the fuyin in the wealth palace tells you that money matters are dormant right now, which may actually be helpful if you want to focus on the relationship without financial distractions.

Fuyin also has a relationship to the heavenly stems and their elemental interactions. When a stem is absent from a palace, the elemental balance of that palace is affected. A palace that would normally be strengthened by a wood stem, for example, loses that support during fuyin. This changes how the door and star in that palace function. A normally favorable combination becomes weaker, while a normally harmful combination also loses some of its bite.

One important nuance: fuyin does not mean the palace is dead or completely powerless. The door, star, and deity are still present and still exert influence. What changes is the intensity. Think of a car engine that is idling. The engine is on, but it is not producing enough power to move the car. Fuyin is like idling. The energy is there, but it is not producing enough force to drive an action to completion. You can still use the energy for lightweight tasks, but for anything requiring real power, you need to wait for the stem to return.

What Is Fanyin in the Hour Chart

Fanyin translates as “reversed” or “counter” energy. Where fuyin is about absence, fanyin is about reversal. In the hour chart, fanyin occurs when the stem in a palace is in an opposing or reversed relationship to what you would expect. This reversal changes the meaning of the palace and modifies how you read the door, star, and deity that share that space.

Fanyin is not the same as a clash or a harmful combination. A clash is when two elements actively attack each other, like metal cutting wood. Fanyin is more subtle. It is a reversal of direction, a turning back, an inversion of the expected flow. When fanyin appears in a palace, the energy there does not flow in the normal direction. Instead, it reverses, which can mean delays, setbacks, reversals of fortune, or unexpected twists related to whatever that palace represents.

In some QMDJ traditions, fanyin is associated with the fuyin and fanyin chart system, which is a specialized branch of QMDJ that studies these patterns in depth. In the hour chart, fanyin is not always a full chart pattern. It can appear in individual palaces, affecting only the areas those palaces govern. You read it palace by palace, noting which palaces have reversed energy and what that means for the question at hand.

Fanyin creates interesting situations because it can be both helpful and harmful depending on what the normal energy would have been. If the normal energy would have been harmful, fanyin reverses the harm into something milder or even beneficial. If the normal energy would have been beneficial, fanyin reverses the benefit into something unexpected or disappointing. This is why fanyin is not simply good or bad. It is a reversal, and the value of the reversal depends entirely on what is being reversed.

Detecting Fanyin in Your Hour Chart

Fanyin detection requires you to compare the stem in each palace against the expected stem for that palace and that hour. The expected stem follows a predictable pattern based on the day stem and the hour branch. When the actual stem in a palace is the reverse of what you expect (for example, when a yang stem appears where a yin stem should be, or when a stem appears in the opposing palace rather than its expected position), that palace is experiencing fanyin.

The technical details of fanyin detection involve understanding the stem rotation cycle and the palace assignments. If you are still learning the stem system, the Stems and Branches Reading guide covers the foundational knowledge. Once you can plot stems correctly, detecting fanyin becomes a matter of comparing what you see against what you expect.

Here is a practical checklist for detecting fanyin:

Step	What to Check	Fanyin Indicator
1	Identify the day stem	Determines the stem cycle for the day
2	Identify the hour branch	Determines which stems land where
3	Plot stems into palaces	Follow the standard rotation
4	Compare each palace stem to expected	If reversed or opposing, mark fanyin
5	Note palace meaning and question	Fanyin in the question palace signals reversal

One subtlety worth mentioning: not all reversed stems are fanyin. The stem rotation system has built in variations that are normal and expected. True fanyin requires the stem to be in a specific type of reversal that goes beyond normal rotation variation. This is why proper training in stem plotting is essential before attempting fanyin detection. If you misidentify normal rotations as fanyin, your readings will be unnecessarily pessimistic or confusing.

How Fanyin Changes Your Reading

When fanyin appears in the palace related to your question, you need to adjust your interpretation. The normal meaning of the door and star in that palace is inverted or delayed. A favorable door may not deliver its usual benefits, or it may deliver them in an unexpected way. An unfavorable door may be less harmful than usual, or its negative effects may manifest in a reversed manner.

Here are some examples of how fanyin modifies readings:

If you are asking about a business deal and the palace governing business shows the Open Door with fanyin, the openness you expect may come in a reversed form. Instead of a straightforward agreement, you might face a situation where the other party appears open but the deal reverses direction at the last minute. You might still get the deal, but not in the form you expected. The fanyin tells you to read the fine print and prepare for changes.

If you are asking about travel and the palace governing movement shows the Rest Door with fanyin, the rest you expect may turn into its opposite. Instead of a smooth, uneventful journey, you might experience delays or disruptions that force you to rest when you do not want to. The fanyin reverses the peaceful quality of the Rest Door into something that feels more like an enforced stop.

If you are asking about a relationship and the palace shows a harmful door with fanyin, the harm you expect may be reduced or reversed. The conflict you anticipated may resolve itself, or the negative energy may turn inward rather than outward. Fanyin does not make bad combinations good, but it can soften their effects by redirecting the energy.

Consider another example: if the Life Door appears in the wealth palace with fanyin, the growth you expect in financial matters reverses. Instead of growing, your money situation might contract temporarily, or the growth might come in a form you did not anticipate. For instance, you might lose money on one investment but gain it through an unexpected refund or credit. The reversal does not change the fact that the Life Door is fundamentally about growth. It changes the direction and form of that growth. For more on using doors in practical readings, see the Eight Doors in Divination guide.

Fuyin and Fanyin Together: What It Means

In some hour charts, you will find both fuyin and fanyin in the same palace. This is a significant pattern. When a palace has both void (fuyin) and reversed (fanyin) energy, the usual rules of interpretation are strongly disrupted. The palace’s energy is both dormant and reversed, which means the normal flow is doubly impaired.

In practice, when both patterns appear together in the palace governing your question, the chart is telling you that the timing is wrong for this action. The energy is not just weak, it is actively flowing against you. The best response is usually to wait for a different hour when the palace is clear of both patterns. If you cannot wait, you need to approach the situation with extra caution and be prepared for setbacks.

However, having fuyin and fanyin in a palace not related to your question is less concerning. It simply means that the area represented by that palace is both quiet and reversed, which may even work in your favor if that area would otherwise interfere with your goal. For example, if the conflict palace has both fuyin and fanyin and your question is about peace, the disrupted conflict energy may actually help you avoid trouble.

Some practitioners treat the combination of fuyin and fanyin as the most unreliable state a palace can be in. Without a stem, the energy has no anchor. With reversal, whatever residual energy exists flows backward. Together, they create a situation where the palace is essentially out of commission. If this happens to be your ruling palace, the chart is not just saying “delay.” It is saying “this entire area of life is unavailable right now.” The solution is always the same: wait for the next two hour block when the stems rotate and the palace regains its stem.

Practical Examples of Fuyin and Fanyin Readings

Let us walk through three practical examples to show how fuyin and fanyin affect hour chart readings in real situations.

Example 1: Business Meeting Timing

You have an important client meeting scheduled. You cast the hour chart for the meeting time and find that the palace governing communication and trade (the southeast, palace 4) is in fuyin. The Open Door is there, which would normally be excellent for a meeting, and the Star of Heaven is also present, which adds authority. But the fuyin means the stem that should anchor this energy is missing.

In this case, the meeting may go ahead but without the full impact you hope for. Your client may be receptive (Open Door) and impressed by your authority (Heaven Star), but the decision may not be finalized during the meeting. The fuyin suggests the energy to close the deal is dormant. You should use the meeting to lay groundwork and schedule a follow up for a time when the palace is not in fuyin.

Example 2: Travel Safety Question

You are planning a trip and cast the hour chart to check travel safety. The palace governing travel (palace 1, North) shows the Fear Door with fanyin. Normally, the Fear Door would warn of alarm and disruption during travel. But with fanyin, the fear is reversed. This could mean that anticipated travel problems resolve themselves unexpectedly, or that a situation which seemed frightening turns out to be harmless.

However, fanyin also means unpredictability. While the fear is reversed, the reversal could go in either direction. The practical advice here is to proceed with the trip but maintain flexibility. Have backup plans. The fanyin tells you that expectations will be inverted, so whatever you anticipate, be ready for the opposite. For more travel reading methods, see the Travel and Movement guide.

Example 3: Health Inquiry

A person asks about a health concern. The palace governing health (palace 2, Southwest) shows the Life Door, which is generally positive for health matters. But the palace has fanyin. The positive life energy is reversed. This does not mean the health situation will worsen. It means the healing or improvement will come in an unexpected way or from an unexpected direction. The person may find that a treatment they did not expect works, or that the path to recovery involves a detour rather than a straight line. For a deeper treatment of health readings, see the Health Questions guide.

Example 4: Legal Matter With Both Patterns

A person asks about attending a mediation session. The ruling palace (northwest, authority and legal matters) has both fuyin and fanyin. The Open Door is present, which would normally be excellent for negotiations. But the void means the opening has no force behind it, and the reversal means whatever openness exists will be inverted. The recommendation here is to reschedule if possible. If not possible, the person should not rely on the mediation going smoothly and should prepare for a situation where the other party’s openness reverses into obstruction.

Fuyin, Fanyin, and the Eight Deities

The eight deities in the hour chart add another layer to fuyin and fanyin readings. When a deity lands in a fuyin or fanyin palace, its influence is modified. The Eight Deities guide covers the full system, but here are the key interactions:

When a positive deity like the Nine Heaven deity lands in a fuyin palace, its beneficial influence is reduced. The deity is present, but without a stem to ground it, the blessing is more potential than actual. When the same positive deity lands in a fanyin palace, its influence may reverse, bringing challenges rather than blessings.

When a negative deity like the Serpent God lands in a fuyin palace, its harmful influence is also reduced. The deception or confusion the Serpent God represents is muted by the void. This can actually be helpful: the negative energy is too dormant to cause real problems. But if the Serpent God lands in a fanyin palace, the deception reverses. It might mean that hidden information comes to light, or that a deceptive situation turns honest. For the full deity system, see the Eight Gods in QMDJ guide.

Here is a table summarizing how deities interact with fuyin and fanyin:

Deity Type	Normal Effect	With Fuyin	With Fanyin
Nine Heaven (positive)	Authority, elevation	Reduced authority	Reversed: challenges instead of blessings
Nine Earth (positive)	Nurturing, grounding	Weakened support	Reversed: instability instead of grounding
Serpent God (negative)	Deception, confusion	Muted deception	Reversed: truth revealed, honesty emerges
Hook (neutral)	Gathering, pulling	Nothing to gather	Reversed: dispersal instead of gathering
Chief (positive)	Leadership, protection	Weakened protection	Reversed: vulnerability instead of protection

Understanding these deity interactions with fuyin and fanyin adds nuance to your readings. The patterns do not simply negate or affirm the deity’s influence. They redirect, reduce, or reverse it, and the specific effect depends on which deity, which pattern, and which palace are involved. A reading that ignores the deity layer misses important context about how the patterns will actually manifest.

Timing Around Fuyin and Fanyin

One of the most practical uses of understanding fuyin and fanyin is timing. If you know that certain palaces will be in fuyin or fanyin during a given hour, you can choose when to act and when to wait. The fuyin and fanyin patterns change with each hour, so a palace that is void now may be fully active in the next two hour block.

Here is a simple framework for timing around these patterns:

If the palace governing your question is in fuyin: wait for the next hour when a stem fills that palace. The energy will be active and your action will have better support. If you cannot wait, lower your expectations and focus on preparation rather than completion. For example, if the wealth palace is in fuyin and you need to send invoices, send them now but do not expect immediate payment. The money will come when the wealth palace regains its stem.

If the palace governing your question has fanyin: be prepared for reversals. If you act during this hour, expect that plans may change direction. Have contingency plans. Alternatively, wait for an hour when the stem is in its correct position and the energy flows normally. If you are negotiating a deal during fanyin, expect the terms to shift before closing. The deal may still work, but in a different form than initially discussed.

If the palace has both fuyin and fanyin: strongly consider waiting. The combined disruption makes this hour unreliable for important actions. If you must act, do so with full awareness that the outcome may be very different from what you expect. For routine tasks, this is manageable. For critical decisions, the risk is significant.

You can learn more about choosing the right time for actions in the Best Door and Direction guide, which covers the broader timing system and helps you identify the optimal windows for different types of actions.

Common Misconceptions About Fuyin and Fanyin

Several misconceptions about fuyin and fanyin circulate in QMDJ study circles. Left uncorrected, these misconceptions can distort your readings and create unnecessary anxiety. Let us address the most common ones.

First, fuyin does not mean bad luck. A void palace is not cursed or harmful. It simply means the energy is dormant. Dormant energy is neutral. What matters is whether you need that energy to be active for your question. If you do, fuyin is a signal to wait. If you do not, fuyin is irrelevant or even helpful. Some students treat every fuyin palace as a disaster, which is like treating a closed shop as a catastrophe. The shop will reopen. The energy will return.

Second, fanyin does not mean failure. Reversed energy is not the same as failed energy. It means the outcome will come in an unexpected form or direction. Sometimes reversals work in your favor, especially when the normal energy would have been harmful. A reversed harmful door is less harmful, and a reversed obstacle becomes an opening. Students who treat fanyin as uniformly bad miss the opportunities that reversal can create.

Third, fuyin and fanyin are not rare or special. They appear in most hour charts because there are not enough stems to fill all nine palaces. Every chart has fuyin somewhere. Fanyin appears in many charts as well. Treating these patterns as rare emergencies leads to overreaction. They are normal features of the chart that you learn to read around, just like a sailor learns to read around changing winds without panicking.

Fourth, you cannot fix fuyin or fanyin with remedies or rituals. These patterns are determined by the time of the chart. They reflect the cosmic energy of the moment, which you cannot change. What you can change is your response: when to act, how to prepare, and whether to wait for a better moment. Anyone who tells you they can “activate” a fuyin palace with a special ceremony is misunderstanding the system. The void will fill when the stems rotate, not before.

The Relationship Between Fuyin, Fanyin, and Empty Palaces

Fuyin, fanyin, and the broader concept of empty palaces are related but distinct. An empty palace is any palace without certain elements. Fuyin specifically refers to the absence of a heavenly stem. Fanyin refers to a reversal of the stem’s expected position. A palace can be empty of a stem (fuyin) without being empty of doors, stars, or deities. And a palace with a stem present can still have fanyin if that stem is reversed.

The Eight Trigrams in QMDJ govern the elemental nature of each palace, and the five elements interactions determine how the stem (or lack of stem) affects the palace’s overall energy. Understanding these relationships helps you see the full picture rather than treating each pattern in isolation. A palace without a stem but with a favorable door and star is very different from a palace without a stem and with a harmful door and star. The void changes the calculation, but it does not erase all other information.

Building Confidence With Fuyin and Fanyin Readings

Confidence with fuyin and fanyin comes from practice. Here are four steps to build your skill:

Step 1: Plot charts regularly and identify fuyin and fanyin every time. Do not just look for them when you have a question. Make it a habit in every chart you cast. Over time, you will develop an intuitive sense of where these patterns appear and how they affect the reading. You will start to notice which palaces go void together and what that means for the hours that follow.

Step 2: Keep a journal of your readings, noting which palaces were in fuyin or fanyin and what actually happened. Compare your predictions to the outcomes. This feedback loop will sharpen your interpretation skills and help you calibrate how much weight to give these patterns. After six months of records, you will have a personal database that tells you which interpretations work consistently and which need adjustment.

Step 3: Study charts from different hours and note how the fuyin and fanyin patterns shift. The patterns change with every two hour block, so you will see variety. This will help you understand the rhythm of these patterns and how they relate to the broader stem cycle. Try casting charts for six consecutive hours of the same day and noting how the fuyin positions rotate.

Step 4: If you want structured guidance, consider the QMDJ Apprentice Course, which covers the hour chart system in detail. Learning from a teacher accelerates your progress and helps you avoid common mistakes. The complete Qi Men Dun Jia guide is also available for self study.

Fuyin, Fanyin, and the Five Elements

The five elements system adds another dimension to fuyin and fanyin readings. Each palace has a governing element based on its trigram. When a stem is absent (fuyin), the element that stem would bring to the palace is also absent. This changes the elemental balance of the palace.

For example, the North palace is governed by Kan (Water). If a water stem is absent due to fuyin, the palace loses some of its water energy. If a metal stem is also absent, the palace loses the metal that would normally generate water. This double absence weakens the palace’s elemental foundation, making it harder for the palace’s door and star to function at full capacity.

With fanyin, the element is present but reversed. A yang wood stem that appears reversed in a metal palace creates a different interaction than a yin wood stem in the same position. The reversal changes the generating and controlling cycles. You need to read the elemental interaction as reversed, which means considering how the reversed element interacts with the palace’s native element.

For instance, if a fire stem appears reversed in the northwest (metal palace), the normal generating cycle would be fire generating earth generating metal. Reversed, the fire might actually control the metal, creating conflict instead of the normal supporting chain. This changes the reading from supportive to disruptive. Without understanding the five elements complete guide, you cannot identify these reversed elemental interactions accurately.

Integrating Fuyin and Fanyin Into Your Standard Reading Routine

To make fuyin and fanyin analysis part of your regular practice, add these steps to your standard reading routine after you have identified the ruling palace and examined the door, star, and deity:

First, check the ruling palace for fuyin. If the stem is absent, note it and adjust your interpretation downward. The favorable door or star you found is still present, but its power is reduced. Lower your expectations accordingly and consider waiting.

Second, check the ruling palace for fanyin. If the stem is reversed, note it and prepare for unexpected outcomes. Tell yourself that whatever you predict, the opposite or something sideways is equally likely. Plan for both directions.

Third, check the opposing palace for fuyin and fanyin. If the opposing palace is in fuyin, the counterforce to your ruling palace is dormant, which is helpful. If the opposing palace has fanyin, the counterforce may reverse, which could be helpful if it was going to be harmful, or problematic if it was going to be supportive.

Fourth, check the center palace. If the center is in fuyin, the overall chart energy is unfocused and dormant. Actions taken during this hour lack the coherence and support that a strong center provides. If the center has fanyin, the overall chart energy is reversed from what you would normally expect.

By making these four checks a standard part of your routine, fuyin and fanyin analysis becomes automatic rather than something you have to remember to do. Over time, you will find that these patterns explain many of the anomalies in your readings that you previously could not account for.

How Different QMDJ Schools Handle Fuyin and Fanyin

It is worth noting that different schools of QMDJ handle fuyin and fanyin differently. Some schools treat fuyin as unimportant and focus only on doors, stars, and deities. Other schools place great emphasis on fuyin and fanyin, considering them among the most important indicators in the chart. The approach in this guide falls between these extremes: fuyin and fanyin are important modifying factors that should always be checked, but they are not the primary indicators. The door, star, and deity in the ruling palace remain the primary reading, and fuyin/fanyin adjust that reading rather than replacing it.

If you are studying with a teacher who follows a particular school, learn that school’s approach to fuyin and fanyin. The underlying patterns are the same across schools, but the weight given to them and the specific interpretation methods can vary. What matters most is that you are consistent in your approach and that you track your results over time to see what works in your practice.

Frequently Asked Questions About Fuyin and Fanyin in the Hour Chart

Is a fuyin palace always bad for my reading?

No. A fuyin palace means the energy is dormant, not harmful. If the palace is unrelated to your question, fuyin may even help by keeping that area quiet. Fuyin is only a problem when the void palace governs the area you are asking about.

Can I still take action if the relevant palace has fanyin?

Yes, but you should prepare for reversals. Fanyin does not prevent action. It inverts expectations. If you act during fanyin, have backup plans and stay flexible about how the outcome manifests.

How many fuyin palaces does a typical hour chart have?

Usually three. The hour chart has six stems rotating through nine palaces, so three palaces are always without stems. Which three changes based on the day and hour.

Do fuyin and fanyin affect the doors and stars in their palace?

Yes. Without a stem to anchor them, doors and stars in a fuyin palace are weakened. In a fanyin palace, their effects may be reversed or redirected. Always consider the stem status when interpreting door and star combinations.

Should beginners worry about fuyin and fanyin?

Beginners should learn to identify these patterns, but not obsess over them. They are normal features of every chart. Master the basic reading of doors, stars, and deities first, then add fuyin and fanyin analysis as you grow more comfortable with the system.

Can fuyin or fanyin appear in destiny charts too?

Yes, but their interpretation differs. In destiny charts, fuyin and fanyin relate to the natal structure and life patterns. The fuyin and fanyin chart system covers this in depth. In hour charts, these patterns are time specific and change with each two hour block.

What happens when the fuyin palace rotates and the stem returns?

The palace regains its full power. The door, star, and deity that were weakened during fuyin return to normal strength. This is why waiting for the next two hour block is often the simplest solution to a fuyin problem.

Can fanyin ever be more favorable than a normal reading?

Yes. If the normal energy would have been harmful, fanyin reverses it to something milder or even beneficial. In such cases, fanyin can be more favorable than a normal reading. The value of the reversal depends entirely on what is being reversed.