8-2 Mechanical Diagnosis
CSR-20 & CSR-40, September 1999
Condition Possible Cause Remedy
Compressor does not Defective compressor Replace compressor
operate — no amperage
draw (continued) Controller shut unit down on Let compressor cool and controller will
Compressor Over Temperature reset automatically. Check liquid injection
(alarm code 82) valve and compressor temperature sensor
Compressor motor internal thermal If compressor contactor is energized, wait
overload protection open 60 minutes for protector to cool and reset.
Compressor does not Rotating scroll stuck Replace compressor
operate; excessive
amperage draw or Seized or frozen compressor bearings Replace compressor
intermittent cycling
on overload Improperly wired Check/correct wiring against wiring diagram
Low line voltage Check line voltage — determine location of
voltage drop
Contacts in compressor contactor not Check by operating manually. Repair or
closing completely replace
Open circuit in compressor motor Check motor stator connections. Check
winding stator winding for continuity. If open,
replace compressor
Defective compressor motor internal Replace thermal overload protector or
thermal overload protector compressor
Refrigerant overcharge or high Check for restricted filter drier or high side,
side restriction causing cycling and refrigerant overcharge
on high pressure cutout
Inefficient condenser operation Check condenser airflow, condenser
causing cycling on high pressure fan motor, fan blade, condenser grille,
cutout condenser coil temperature sensor, water
pressure switch (option), water flow rate
(option) and water-cooled condenser-
receiver tank (option)
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