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TROUBLESHOOTING
SYMPTOMS CAUSE
I
REMEDY
SYMPTOMS
Compressor does
not run
CAUSE REMEDY
Unit operates
long or
continuously
Power
line open
Reset circuit breaker.
Control fuse
open
Safety thermostat
tripped (DGT)
Check control circuit
for ground or short.
Replace fuse.
Move RUN/STANDBY
switch to STANDBY,
then back to RUN.
Tripped power
breaker
Check the controls.
Find cause of trip
and reset breaker.
Service load
lating
pump not
System Noises
Compressor noisy 1 Check valve plates
Improperly wired
controls
Low line voltage
Check wiring and
rewire.
Check line voltage
-
determine location of
voltage drop and
remedy deficiency.
for valve noise.
ReDlace
comDressor
(w&n bearings)
Check for loose
compressor
hold-
down bolts.
Compressor motor
defective
Check motor winding
for open or short.
Replace compressor,
if
necessary.
Compressor
loses
oil
Seized compressor
Reolace
comPressor.
Loss of charge control
1
Repair leak;Compressor
cycles off on toss
of charge
Compressor
shuts down on
high-pressure
control
erratic in action
I-
Low refrigerant charge Add refrigerant.
High-pressure control Replace control.
erratic in action
Expansion valve
relay contacts.
Check cooler and
Frosted
suction line
Compressor discharge
Open valve, or
re-
valve partially closed
place
if defective.
Air in system
Condenser scaled
1 Purge.
Clean condenser.
Hot
liquid
line
Receiver not properly
vented
-
refrigerant
backs up into evap
condenser
Repipe as required,
providing adequate
venting.
Frosted liquid
line
restricted
Restricted
Remove restriction
filter
drier
Condenser water pump
Start pump- repairor
or fans not operating replace if defective.
Compressor will
not unload
control
valve
Compressor will
not load
control valve
Plugged strainer
(high side)
Clean or replace
strainer.
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