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Checking PTC Relay
1.
Disconnect power to the refrigerator.
2. Remove the combo device from compressor.
3.
Place meter on ohm’s scale.
4. Check PTC relay at pins 5 and 6 on back side of
the relay (the portion that plugs into compressor.
(Resistance should be approximately 6Ω - 11Ω).
5. If the PTC relay is open, replace the combo
device.
Things to check if faulty PTC Relay is found
:
•
Dirty condenser
• Condenser fan motor not running
• Low voltage, less than 105 VAC
• Refrigerator on an unapproved extension cord
• Shorted, stalled or grounded compressor
Checking Run Capacitor
1.
Disconnect power to the refrigerator.
2. Remove the combo device from the compressor.
3.
Place meter to capacitance (set meter to
CAP
)
and place meter leads to the capacitor. The
meter should display approximately 12 µF.
4. Replace the run capacitor if open or shorted.
The compressor will start and run without the run
capacitor being in the circuit, but will not run as
efficiently.
Checking Compressor Electrically
1.
Disconnect power to the refrigerator.
2. Remove combo device from the compressor.
3.
Place meter on the ohm’s scale.
4.
Take the following three readings (see wiring
diagram for compressor resistance values).
• Between Run and Start
• Between Common and Start
• Between Common and Run
Refer to the refrigerator schematic for compressor
resistance values.
5. Place one meter lead to case ground and the
other to any of the three compressor terminals
alternating between the R, C, and S, to check for
a grounded compressor.
6. If the compressor is stalled, shorted, opened, or
internally grounded, the replace the compressor.
Things to check if faulty compressor is found:
•
Dirty condenser
• Condenser fan motor not running
• Low voltage, less than 105 VAC
• Refrigerator on an unapproved extension cord
Refer to the mini manual for correct electrical resistances
