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© 2014 Pentair Equipment Protection
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SYMPTOMS AND POSSIBLE CAUSES - THERMOSTAT VERSION
SYMPTOM
POSSIBLE CAUSE
Unit won’t cool
Clogged fins on coil(s)
Dirty filter
Impellers not running
Compressor not running
Compressor runs, but has bad valves
Loss of refrigerant
Compressor tries to start but won’t run
Low line voltage at start. Should be +/-10% rated voltage.
Compressor motor stuck
Bad contactor
Bad overload switch
Bad run/start capacitor
Unit blows breakers
Undersized breaker/fuse or not time delayed
Short in system
Getting water in enclosure
Drain plugged
Drain tube kinked
Enclosure not sealed (allowing humidity in)
Mounting gasket damaged
For additional technical support, contact Pentair Equipment Protection at 800-896-2665.