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16.0 TROUBLE SHOOTING
In diagnosing common faults in the heat pump system, develop a logical thought
pattern as used by experienced technicians. The charts which follow are not intend-
ed to be an answer to all problems but only to guide the technician’s thinking.
Through a series of yes and no answers, follow the logical path to a likely conclu-
sion.
A novice technician should use these charts like a road map. Remember that the
chart should clarify a logical path to the problem’s solution.
16.1 ELECTRICAL CHECKS FLOW CHART
Unit Running?
NO YES
Thermostat Problem? Go to
Mechanical Checks
YES NO for Cooling or Heating
Repair and Recheck
Transformer Problem?
YES NO
Repair and Recheck
Voltage on Compressor
Side of Contactor?
YES NO
Run Capacitor Voltage on Line
Side of Contactor?
Start Capacitor
NO YES
Potential Relay
Circuit Breakers Compressor Contactor
Compressor Internal or Fuses Open
Overload Open Hi Pressure Cut-Out
YES
Compressor Winding Open Hot Gas Sensor
Compressor Winding
Unit Wiring and Grounded Compressor Time-Delay
Connections
Outdoor Fan Motor Unit Wiring and
Grounded Connections
Grounded Capacitor
Replace Fuses
or Reset Breakers
and Recheck System
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