STI 18729 - Manual (Page 13)

© 2010 Pentair Technical Products 89059119 - 13 -
Symptoms and Possible Causes:
SYMPTOM POSSIBLE CAUSE
Unit won’t cool
Clogged fins on coil(s)
Dirty filter
fans 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 information (i.e., amp draw, pressures, temperatures) , contact Pentair
Technical Products at 800-896-2665.