F9 names two boards and the wiring as possible causes.
Model compatibility: KitchenAid reuses codes across series and model years, so F9 may mean something different on another appliance or generation. Confirm this against your model’s documentation and record your full model number before acting.
What this code means
The oven could not execute the function; possible appliance control board, relay control board or wiring problem.
One code, two boards
The KitchenAid entry for F9 on the over-the-range microwave reads that the oven was unable to execute the function. It then offers two boards, the relay control board and the appliance control board, as possibilities, along with the wiring.
At a glance
| Code | F9 |
|---|---|
| What it means | The oven could not execute the function; possible appliance control board, relay control board or wiring problem. |
| What you can check | Shut off power at the breaker for one minute, then reapply it and stay near the unit for a minute watching for the code. Check operation. |
| When to call a technician | If F9 shows again, schedule a service visit. Either of two control boards or the wiring may be involved, so note any codes in the order they appeared. |
Comparison table
| Code | Which board |
|---|---|
| F1E1, F6 | Relay board only |
| F1E4, F6E0, F7 | Appliance board only |
| F9 (here) | Both boards |
As the least specific of this group, F9 offers nothing to separate one board from the other, and KitchenAid does not explain why.
Steps
- Shut off power at the microwave’s breaker(s); one minute is the time given.
- Reapply power.
- Stay near the unit for one minute to watch for F9.
- Check operation.
If F9 shows again
The article’s sole next step is a service visit. Since two boards are listed, the technician will want the model number and your reset history.
Careful wording, explained
KitchenAid’s pages lean on “may be.” For F9 that qualifier spans two boards and the wiring, and so even the help page declines to pin the fault on one part. The real fault gets confirmed by a technician on site. Should several codes appear on the display one after another, record them in sequence. That scenario goes unmentioned in the article, but the order is a clue worth passing on.
Codes with a letter after F9
F9Q lists no cause; F9Q1 is the touch pad entry. Neither is the same as F9.
F9 microwave repair in KitchenAid metro areas
Our number for the Miami, New York, Houston, Los Angeles and San Diego metro areas is (844) 919-2035. Say the display read F9 only.
Source: KitchenAid Product Help, Over-the-Range Microwave Error Code
Important safety warning. Do not attempt repairs involving electrical components, gas, water lines, refrigerant or sealed systems. Unplug the appliance if it is safe to reach the outlet, and leave internal diagnostics to a qualified technician.
Sources & references
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