GE JS998 Series - Cooling Fan Failures Troubleshooting; Left Cooling Fan Not Working Troubleshooting

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Enter the service mode.
Does the left cooling fan come on?
No
Disconnect the connector on the left cooling fan.
Is 120 VAC present from the MPB relay K5 NO
contact to AC IN (NT)?
Yes
No
Is 120 VAC present from the MPB
relay K5 NO contact to the EMI
filter board IN2 contact?
Yes
Is 120 VAC present from the MPB
relay K5 NO contact to the EMI
filter board OUT2 contact?
Yes
Is 120 VAC present from the MPB relay
K5 NO contact to the left cooling fan?
Yes
Is 120 VAC present from the positive
contact to the negative contact
of the left cooling fan?
Yes
Replace the left
cooling fan.
Is 120 VAC present from
the MPB relay K5 COM
contact to AC IN (NT)?
Yes
Is 0 VDC present from the MLB
connectors J3, pin 9 to J5, pin 2?
Yes
No
Is 120 VAC present from
the EMI filter board OUT3
contact to AC IN (NT)?
No
Is 120 VAC present from
the EMI filter board IN3
contact to AC IN (NT)?
No
Replace the one shot
TCO or repair the faulty
wiring from L2 input to
the EMI filter board.
Repair the faulty wiring
from NT input to the EMI
filter board.
No
No
Replace the
EMI filter board.
Repair the faulty wiring
from the EMI filter board
to the left cooling fan.
No
Repair the faulty
wiring from the MLB
relay K5 NO contact
to the left cooling fan.
No
No
Replace
the MLB.
Replace
the MPB.
Repair the faulty wiring from
the MPB relay K5 COM
contact to the EMI filter board.
Yes
Replace the EMI
filter board.
Yes
NOTE:
The left, rear fan on the Slide-In model is identified as left cooling fan.
The single and double wall oven identify this fan as the HVT fan.
Left Cooling Fan Does Not Work