GE AZ85E09DAC Technical Service Manual page 42

No Fan Operation
1. Read the DC voltage at the main board wire
jumpers JP68 and JP72 (indoor fan motor), or
JP65 and JP72 (outdoor fan motor). Use the
black meter lead on JP72.
a. No DC voltage from main board - replace
main board.
b. Voltage OK - 2 - 2.5 VDC - proceed to drive
board and motor testing in following steps.
2. Test DC motor voltage output from drive board
(1.4x AC input).
I.D. Motor - CN103, red to black
O.D. Motor - CN102, red to black
a. No DC voltage - check FU102 - open, check
both motor resistances red to black.
b. Shorted red to black - replace FU102 and
shorted motor.
c. FU102 OK - replace drive board.
3. Single motor not operating.
a. Substitute new motor to the fan connector
on the drive board.
b. Fan motor operates - replace defective fan
motor.
c. No operation - replace drive board.
4. Single motor short cycles (30 seconds ON - 60
seconds OFF).
a. Substitute new motor to the fan connector
on the drive board.
b. Fan motor operates - replace defective fan
motor.
c. Same operation - replace drive board.
5. Both fans short cycle.
a. Replace drive board.
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JP72
JP68
JP65