Dometic CD20 Service Manual page 8

Diagnostic Procedures
Component
8
Diagnostic Question
Condenser Fan
Is the condenser fan receiving power
from the control module?
Does the condenser fan make loud
or uncharacteristic sounds, such as
humming?
Does the condenser fan still not function
properly after performing the above
diagnostic tests?
Control Module
Is the control module properly connected
to and receiving supply power?
Is the polarity correct?
NOTICE: Reversed polarity can blow fuses and might cause damage the control module.
Is the control module receiving a run
signal?
Are all other wiring connections correct?
Are the LED lights on the thermostat
assembly illuminated or flashing?
Does the control module still not function
properly after performing the above
diagnostic tests?
Action Based On Status
• Manually test the condenser fan to ensure
that it works correctly.
• Ensure that the control module is properly
wired to send power to the fan.
• Correct any wiring issues as needed.
• Verify that the fan is clean and that it
moves freely without obstruction.
• Clean the fan and remove any debris as
needed.
• Manually test the condenser fan to ensure
that it works correctly.
Replace the condenser fan.
• Ensure that the module is properly
connected and receiving power from the
12 VDC or 24 VDC supply circuit.
• Correct any power issues as needed.
• Ensure that the module positive and
negative inputs are correctly wired.
• Correct any polarity issues as needed.
• Place a jumper wire on the C and T
terminals of the control module to verify
that the run signal is being received.
• Correct any wiring issues as needed.
• Ensure that the control module inputs and
outputs are correctly wired.
• Correct any wiring issues as needed.
• Verify whether the LED lights on the
thermostat assembly are flashing.
• Correct any issues as needed.
Replace the control module.
Refrigerators
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