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Error code · Microwave

Whirlpool OTR Microwave Error F9: Control and Relay Boards

Whirlpool over-the-range microwaves such as WMH31017HS, WMH32519HZ and WMH53521HZ display F9 when the oven could not execute the function. The wording behind it names the appliance control board, the relay control board and the wiring that…

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Code
F9
Appliance
Microwave
Brand
Whirlpool
Warranty
30-day workmanship

What F9 means

Whirlpool over-the-range microwaves such as WMH31017HS, WMH32519HZ and WMH53521HZ display F9 when the oven could not execute the function. The wording behind it names the appliance control board, the relay control board and the wiring that joins them. At the microwave, a button press leads to nothing and the display shows F9. It marks a pair of circuit boards to examine and does not confirm that either has failed.

Common causes of F9

  • Appliance control board
  • Relay control board
  • Wiring between the two boards
✓ One safe check you can try

1. Turn the microwave's circuit breaker off. 2. Wait a full minute, then turn it back on. 3. Watch the display for sixty seconds in case F9 returns. 4. If it stays clear, repeat the function that did not run earlier and see whether it works now.

! Why to stop there
  • If F9 returns, the reset has not touched the cause, so both boards and the wiring between them need testing.
  • The relay board switches the loads, so we check what it sends and what the control asks for.
  • Boards are costly, which is why we confirm the cause and give you a written price before ordering.
Opening a panel yourself does not automatically cancel a manufacturer warranty, but it can cause accidental damage, and some manufacturers set their own service conditions. Check your warranty terms, or ask us, before deciding.
→Same appliance

Other Microwave codes

FC E3Whirlpool Over-the-range Microwave Showing FC E3 for Wi-Fi: Module Check FC E7Whirlpool OTR Microwave Connection Code FC E7: Appliance Not Reaching the Internet FC E8Whirlpool OTR Microwave Registration Code FC E8: Entry Mistake FCE8Whirlpool Over-the-range Microwave Registration, FCE8: Wrong Model Selected Feature Not Available or Fault DetectedWhirlpool Built-in Microwave Message "Feature Not Available": Retry or Cut Power LOCWhirlpool Microwave LOC on the Display: Control Lock Is On PFWhirlpool Over-the-range Microwave Showing PF: Power Failure Indicator Press Cancel to ResetWhirlpool Built-in Microwave Message "Press Cancel to Reset": Error Cleared by Cancel
F9F9 questions
What is a relay control board?

It is a board that switches the microwave's loads on and off when the main control asks. F9 says the control or the relay board, or their wiring, could not complete the request.

Is F9 the same as F9Q?

No. F9Q is a different code with only a power reset in its guidance. F9 names the control and relay boards, so we test those circuits.

Should I buy a new microwave when F9 appears?

Not before a diagnosis. A wiring or board issue may be repairable, and we tell you honestly when a new unit is the better choice.

Book a visit

Still seeing F9?

A technician diagnoses it on site and gives you the price in writing before any work starts.

(713) 589-6107