Paul for Model Number KEMS378SWH04 MICROWAVE ACTS LIKE IT'S RUNNING, BUT NO HEAT UP 1. I had a pro come out. He replaced the door switches, Still no heat, but after 22 seconds F1E5 error comes up. One of the switches did show poor function in the machine, but worked on the bench. 2. He said it was the inverter. Brought a new one, still same error code; cleared error code and repeated a couple of time. He called Kitchenaid. First level tech no help, second level said replace the inverter again, then the magnetron, and if still no good replace the appliance manager. I decided I could guess as well as them. 3. I ordered all three parts from you. Came quickly, good price. Put in the inverter in. Started to replace the magnetron, but when taking the thermistor (diagram part 21) out, it cracked and fell apart. AHA. I have that part on backorder someplace - nobody has it back to Whirlpool. Maybe never will come. OK, I decided the thermistor was safety device and shorted around it to test with the old magnetron. NO MORE ERROR CODE, BUT NO HEAT EITHER. I figure I don't actually USE the microwave this way, but I put the sides back on for testing purposes. 4. I read some of the other questions, looked at the circuit diagram, and checked my resistance through the magnetron terminals at < 1 ohm (across terminals), open either terminal to ground. This sounds like my existing magnetron is OK. 5. I'm assuming magnetron OK for now. I saw in another question you said diode of transform, but there is no diode on the online parts diagram nor the tech diagram that came attached in the microwave, and the only transformer isn't even on the same part of the parts diagram. Suggestions appreciated. Should I put in the appliance manager board? Thanks.
Answer Hello Paul, I would replace the inverter board W10217711 and the appliance manager WPW10350780 at the same time since the inverter board caused the fault code and it could be damaging the appliance manager board. The magnetron thermistor is W10852735. Read More... Answered by AppliancePartsPros.com | Friday, February 23, 2018
Answer Paul, This unit will not have a diode or transformer as it uses an inverter board in place of it. With the magnetron testing ok and the switches having been replaced then this will most likely be the appliance manager causing this issue but will want to replace that thermistor as well. Read More... Answered by AppliancePartsPros.com | Friday, February 23, 2018