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www.partselect.com/JustForFun/Kitchen-Aid-Appliance-Fault-Codes.aspx Fault codes for a number of KitchenAid appliances, including two and four digit codesfor ... F9 - Oven Door Lock Failure - Check door lock switches and wiring.
This oven is
programmed with a self diagnostics failure code system which will
help for troubleshooting, H97, H98 and H99 are the provided failure
magnetron and inverter circuit problem areas. This section explains
failure codes of H97, H98 and H99. H97, H98 and H99 appears in
display window a short time after start key is pressed and there is
no microwave oscillation.
There is not a lot the layman can do except maybe to try a new magnetron. It is a job for an experienced Panasonic Microwave repair man.
This can sometimes by caused by a power surge or glitch through the electrical lines. You can sometimes clear this fault by completely unplugging the microwave for 1 minute. Plug it back in and see if the fault code returns. If it does, then you have an internal component failure that will need to be serviced by a technician. Microwaves must be serviced by technicians due to the inherent dangers involved in repairing these appliances. Internal capacitors can retain a lethal electrical charge even though the unit is completely unplugged. A microwave radiation leakage test must be performed on the unit following any internal component repair.
It does not ALWAYS indicate a inverter control board problem however in other brands/models. LG's service manual (for an example) suggests the f-9 code could be due to line voltage, magnetron, inverter module, "Relay2", or a loose connection between door/magnetron/control pcb. Other indications might help narrow down these choices before having to pull out your multimeter and crack open the microwave case. For example, if the microwave works, but heats slowly, then the troubleshooting manual narrows your choices down to magnetron or line voltage problems, and pretty much rules out the other possibilities.
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Troubleshooting of Inverter Circuit (U) and Magnetron .
This oven is programmed with a self diagnostics failure code system which will help for troubleshooting, H97, H98 and H99 are the provided failure magnetron and inverter circuit problem areas. This section explains failure codes of H97, H98 and H99. H97, H98 and H99 appears in display window a short time after start key is pressed and there is no microwave oscillation.
The microwave is capable of giving you a serious electrical shock even when it's unplugged , so I recommend you to call a repair technician for help .
F9 indicates a problem with the door latch. There is a safety switch that will not allow the microwave to operate if it detects the door is not closed properly. Even though physically it may seem the door is shut, the safety switch is not relaying the message to the onboard computer. You need another door latch switch.
F9 is an error that indicates an inverter board or magnetron has failed. With the F9 error cleared, start the oven and listen for a ticking sound. The inverter will attempt to 'fire' the magnetron 5 times.(ticking sound). If can hear ticking, replace magnetron. Check owners manual. Part may be covered by limited warranty.