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42 TROUBLESHOOTING
Troubleshooting:
F4: MONITOR (Door Monitor Defective)
NO
YES
Is the F3 or F4 fuse blown?
YES
Disconnect oven from
power supply and then
reconnect. The fault
should clear.
Replace the F3 or F4
fuse (see page A-5
through A-6).
NO
Are the switches open-
ing in the correct
sequence (P, S, M)? To
access
TEST MODE or for
info on status indicators,
see page 15.
Readjust the monitor safety switch.
See page 26 for instructions.
Disconnect oven from power supply
and then reconnect. The fault
should clear.
Troubleshooting:
F5: MAG TEMP (Magnetron Over Temperature)
NO
YES
Fault message
should disappear.
NO
Replace the control board
(pages A-7 through A-8).
Verify wiring. If neces-
sary, replace the cooling
fans (see pages A-7
through A-8).
Open the top cover, place the oven in
TEST MODE and test the magnetrons
(see page 15). Are the magnetron
cooling fans operating?
Correct wiring/
replace the thermo-
stats (pages A-12
through A-13).
NO
YES
Are the switches
closing in the
correct sequence
(M, S, P)?
Remove the debris
or reposition the
oven away from
obstruction.
YES
NO
NO
YES
Do the magnetrons pass testing in the
TEST MODE? See page 15.
NO
Is the airpath into the electri-
cal compartment blocked or
clogged with debris? Check
the cooling fan finger guards
and filter on the back panel.
YES
Verify wiring to
magnetrons, and verify
magnetron thermostats are
not open. Are wiring and
thermostats ok?
Replace the magnetron(s) (page A-12
through A-13) and test again in
TEST
MODE
. Do the magnetrons pass testing?
YES