- Appliances
- Microwave ovens
F6
Whirlpool F6 on a microwave: function not executed, relay board
Risk level
Medium
Proceed carefully and stop if the check is unclear.
Urgency
Medium
Quick answer
On a Whirlpool over-the-range microwave, F6 means the oven could not execute the function, with a possible problem in the relay control board or its wiring. Whirlpool says to switch the breaker off for one minute and verify operation.
Safety first
Stop and check this first
- An over-the-range microwave is not taken apart to check boards or wires: the high voltage capacitor can keep a lethal charge even with the power off. Magnetron, door seals and safety interlocks are for authorised service only.
Safe checks you can perform
- Which function failed
- Breaker off for one minute
- Test of the function that failed
Leave these tasks to a qualified professional
- Do not attempt this professional task: All functions test
- Do not attempt this professional task: Relay board and wiring check
What a technician must be able to justify
Technician visit
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
All functions test
What they doAfter the repair, the technician tests the failing function with a load and the unit's other functions.
They must show youeach function switching on with no code.
In writingthe functions tested and the result.
Relay board and wiring check
What they doThe authorised technician checks the relay board on the failing function and the wiring continuity, with the service manual and after discharging high voltage.
They must show youthe check of the board on that function and of the wire.
In writingthe cause, the replaced part with its part number and the reason.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Follow these steps
Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
Which function failed
- Who:
- you, no tools.
- How:
- note what you were asking the unit to do when F6 appeared, for example heating or a specific programme.
- Result that matters:
- the specific function that did not run.
- If it is always the same function:
- note it; it guides the technician.
- If it appeared with different functions:
- note that too; it suggests a broader fault.
- Evidence to keep:
- note of the function and a photo of the display.
Evidence: F6 - Error Code - Over-the-Range Microwave
Breaker off for one minute
- Who:
- you, at the breaker panel and without opening the unit.
- How:
- switch the microwave's breaker or breakers off for one minute, switch them back on and watch the display for another minute, as Whirlpool says.
- Result that matters:
- whether F6 reappears within that minute.
- If it does not return:
- try the function that failed again.
- If it returns:
- the relay board or its wiring must be checked; call Whirlpool service.
- Evidence to keep:
- time of the cut and whether the code came back during the minute.
Evidence: F6 - Error Code - Over-the-Range Microwave
Test of the function that failed
- Who:
- you, with a microwave-safe container of water.
- How:
- with a microwave-safe container of water inside, ask for the same function that gave F6 and watch. Do not run it empty.
- Result that matters:
- that the function runs without F6.
- If it works:
- solved; watch for a repeat.
- If F6 returns:
- stop using that function and ask for service.
- Evidence to keep:
- note of the function tested and the result.
Evidence: F6 - Error Code - Over-the-Range Microwave
Still not solved
If the error persists, stop here. See what the technician must do and show you.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- Appliances
- Brand
- Whirlpool
- Product type
- Microwave ovens
Known code variants
- F-6
- microondas Whirlpool F6 relés
- Whirlpool F6 over the range
- Whirlpool microondas F6
- Whirlpool microwave F6
- Whirlpool microwave F6 relay board
- Whirlpool over the range F6
What it means
Whirlpool defines F6 like this: the oven could not execute the function, and there may be a problem with the relay control board or the associated wiring. Whirlpool does not say which function failed: it depends on what you asked the unit to do. Nor does the code say whether the fault is in the board or the wire, so on its own it does not justify replacing the board. The page is Whirlpool US's over-the-range microwave guide; confirm the code in your model's manual.
Warnings and stop conditions
- Higheditorial warning
An over-the-range microwave is not taken apart to check boards or wires: the high voltage capacitor can keep a lethal charge even with the power off. Magnetron, door seals and safety interlocks are for authorised service only.
Evidence: F6 - Error Code - Over-the-Range Microwave
Symptoms and causes
Probable causes · in order
- Relay control boardPossible
Whirlpool names it as a possible origin. It fits if F6 returns after the reset, always when asking for the same function.
Evidence: F6 - Error Code - Over-the-Range Microwave
- Relay board wiringPossible
Whirlpool also mentions the associated wiring. A loose connection can block the function with a healthy board; the technician separates them.
Evidence: F6 - Error Code - Over-the-Range Microwave
- One-off faultPossible
If after the one minute cut the microwave works normally and F6 does not return, there is no fixed fault.
Evidence: F6 - Error Code - Over-the-Range Microwave
Virtual technician
Does F6 still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
- 1
F6 - Error Code - Over-the-Range Microwave
Whirlpool · 2026 · official_doc
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