TROUBLESHOOTING
Compressor will not run.
a) Main switch open.
Circuit breakers open
a) Close switch
b) Fuse blown
b) Check electrical circuits and motor winding for shorts or grounds. Investigate
for possible overloading. Replace fuse or reset breakers after fault is corrected.
c) Thermal overloads
tripped or fuses blown
c) Overloads are auto. Reset. Check unit closely when unit comes back on line.
d) Defective contactor or
coil
d) Repair or replace
e) System shut down by
safety devices
e) Determine type and cause of shut-down and correct it before resetting safety
switch.
f) No cooling required
f) None. Wait until unit calls for cooling.
g) Liquid line solenoid
will not open
g) Repair or replace coil
h) Motor electrical trouble
h) Check motor for opens, short circuit, or burnout
i) Loose wiring
i) Check all wire junctions. Tighten all terminal screws.
Compressor noisy or vibrating.
a) Flooding of refrigerant into crankcase
a) Check setting of expansion valve
b) Improper piping support on discharge coil or liquid
line*
b) Relocate, add, or remove hangers
c) Worn compressor
c) Replace
High Discharge Pressure
a) Condenser water insufficient or temperature too
high
a) Readjust water regulating valve. Investigate ways
to increase water supply
b) Fouled condenser tubes (water cooled
condenser). Clogged spray nozzles (evaporative
condenser). Dirty tube and fin surface (air cooled
condenser)
b) Clean
c) Non-condensable in system
c) Purge the non-condensables
d) System overcharged with refrigerant*
d) Remove excess
e) Discharge shut off valve partially dosed
e) Open valve
f) Condenser undersized*
f) Check condenser rating tables against the
operation
g) High ambient conditions*
g) Check condenser rating tables against the
operation
