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These above range microwaves "hoods" automatically turn on a cooling fan even when the microwave is not in use. If you read the manuals you will see warnings about the fans automatically starting. Even when the microwave is not in use opening the door likely interrupts the power to the automatic cooling fan.
Models: GH9177XL GH5176XP GH5184XP GH6178XP GH6177XP
Microwave will not operate (cook). F7 error code
appears on the display.
Electrical circuit interruption between L1 and Neutral in
the microwave inverter circuit.
1. Check door, hinge and cavity front alignment and adjust
2. Check the operation of all interlock switches.
3. Check over temperature protector for the magnatron.
4. Check all Cavity Thermostats for closed circuit.
5. Unplug the oven for at least 40 seconds. If this solves
A. Check the Cooling Fan for proper operation or
B. Check the resistance of the magnetron thermostat.
It should be 0 Ohms, replace if necessary.
6. Check that the control cable to the 1100 watt inverter
is properly connected to plug P2 on the display PCB
& Adjust or Reconnect
7. If interlock switches operate correctly, replace 1100W
8. If problem persists, replace control assembly.
Please let me know if you need any more help or have further questions about anything that I have posted. I would be glad to help
Check to see if there's a relay providing power to the fan. If there is, the contacts might be sticking in the closed position. Assuming that this is an over-the-range unit, disconnecting the vent fan completely might not be a good idea as heat/steam from foods cooking on the range would more likely damage the microwave.
Inspect the power cordUnplug
the power cord and check for voltage at the outlet. Also inspect for
damage, shorts, or burn marks that can be a possible safety hazard.
Bad door switchIf your
microwave does not work at all and you know everything is plugged in
properly and the outlet is functioning, then also check the door hooks
and the door release button. Using a volt-ohm meter on RX1, check your
terminals. When your microwave door is closed you should have a reading
of zero. Once the door is open the reading should change to infinity. If
these readings do not match up, replacement of the door switch is
Blown fusesTo determine
if your fuse has blown out, which may attribute to your microwave not
running, you need to pull the fuse out using a pair of fuse pullers. Lay
it down and using a volt-ohm meter on RX1, check both ends of the fuse
in question. If you do not get a reading of zero, then you will need to
replace the fuse.
Bad fan motorLocate the
fan and remove the leads. Again using the volt-ohm meter on RX1, check
the terminals. If an infinity reading is displayed, it means that the
fan has gone bad and requires replacement.
You have no power to the unit. Breaker is out or the hot wires into the hood has come apart. The wires coming into the unit usually terminated in a junction box next to the fan housing. Teas it for power an/or reset breaker.
I had the same problem with the fan not wanting to shut off after the repair. Once I set the clock though I was able to push the button to shut the fan off. So try setting your clock first and see if that helps.
The problem is that the magnetron is arcing when it is running and it has found a couple bare spots 'exposing the metal'. The microwave uses a special industrial white enamel paint to prevent arcing, it is very important that the oven be removed from service until the situation is rectified otherwise there is a danger of shorting out the magnetron.
You have to take the casing off he microwave and you should be able to see the fuse in there. Your going to have to order the fuse so i would call a parts aplliance place and ask them what fuse that woul be and try that.
F3H Humidity sensor failure 1. Unplug microwave oven or disconnect power.
2. Connect a new sensor to the board (at P5).
3. Plug in microwave oven or reconnect power.
4. If no failure code appears when starting sensor function:
Unplug microwave oven or disconnect power.
Replace old sensor.
5. If failure code appears when starting sensor function:
Unplug microwave oven or disconnect power.
Replace power supply board.
6. Plug in microwave oven or reconnect power.