The F90 error code indicates that the door unlock time exceeded. This will happen if the lock is in the locked position with the oven door open or if the lock motor fails. Have someone hold in the oven door light switch while you set the control up for the self-cleaning cycle. Let the self-cleaning cycle run for only 4-5 minutes then press stop/cancel. This should allow the lock assembly to reset & retract the door lock back into the unlocked position.
You can also try resetting the appliance by disconnecting it from the outlet or switch off the circuit breaker for 20-30 minutes. Once power is restored run a test cycle. If this does not work I suspect a door lock assembly failure. This type of diagnosing will require accessing the lock assembly & using a volt/ohm meter for testing
Error Code E90 typically means that you have a faulty motor door latch, lock motor assembly, door light switch or a defective EOC. You would need this to be diagnosed by a professional technician in order to properly repair the wall oven.
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