Instruction manual

20
ELECTRICAL CHECKS FLOW CHART
Unit Running?
NO
NO
NO
NO
NO
YES
YES
YES
YES
Thermostat Problem?
Transformer Problem?
Run Capacitor
Compressor Contactor
Hi Pressure Control
Compressor Winding Open
Grounded Capacitor
Lo Pressure Control
Compressor Time-Delay
Start Capacitor
Potential Relay
Go to
Mechanical Checks
YES
Repair and Recheck
YES
Repair and Recheck
Voltage on Compressor
Side of Contactor?
Voltage on Line
Side of Contactor?
Circuit Breakers
or Fuses Open
Compressor Winding
Grounded
Unit Wiring and
Connections
Replace Fuses
or Reset Breakers and Recheck
Unit Wiring and
Connections
Condenser Fan
Grounded
Compressor Internal
Overload Open
TROUBLE SHOOTING
In diagnosing common faults in the air conditioning system, it is useful to present
the logical pattern of thought that is used by experienced technicians. The charts
which follow are not intended to be an answer to all problems, but only to guide
your thinking as you attempt to decide on your course of action. Through a series of
yes and no answers, you will follow the logical path to a likely conclusion.
Use these charts as you would a road map, if you are a beginning technician. As
you gain experience, you will learn where to establish the shortcuts. Remember
that the chart will help clarify the logical path to the problem.