GE PFSS9PKY Technical Service Manual page 83

Defrost Heaters
Freezer Defrost Heater
The Freezer Defrost Heater has a resistance value of
approximately 56 Ω and is in a parallel circuit with
the duct heater. (See
Duct Heater
Disconnect CN70 from the board. Check for a
combined resistance of 55 Ω between pin 9 to CN71
pin 9, when the defrost safety thermostat is closed.
A reading of approximately 3.18K Ω will indicate an
open freezer defrost heater, wiring, or connection.
Freezer Defrost Heater Error Code
Freezer Defrost Heater Circuit
Refrigerator Defrost Heater
With CN70 unplugged from the board, read
resistance between pin 7 to CN71 pin 9. Refrigerator
Defrost Heater should read approximately 120
ohms.
Refrigerator Defrost Heater Error Code
.)
Note: To functionally test the defrost heaters,
energize the heaters by using the test mode. (See
Test Mode Operation
Compressor
Note: There is a 5-minute delay start with a cold
cabinet.
The compressor utilizes a "Switched Neutral" circuit.
The L1 side is always "hot".
Read between CN1 pin# 1 (L1) on power supply
board to CN71 pin# 7. Test will show 0 VAC, if board
wants compressor to run.
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Refrigerator Defrost Heater Circuit
.)
Compressor Circuit