what is an F7 error on a whirlpool microwave?

Models: GH9177XL GH5176XP GH5184XP GH6178XP GH6177XP
KHHS178L KHHS179L

Microwave will not operate (cook). F7 error code
appears on the display.

Electrical circuit interruption between L1 and Neutral in
the microwave inverter circuit.

Possible reasons:
1. Check door, hinge and cavity front alignment and adjust
as needed.
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
the problem
A. Check the Cooling Fan for proper operation or
blockage
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
inverter.
8. If problem persists, replace control assembly.

CJ
March 2007