TROUBLESHOOTING
SYMPTOMS
CAUSE
REMEDY
SYMPTOMS
Compressor does
not run
CAUSE
REMEDY
Unit operates
long or
continuously
Power l i n e o p e n
Reset circuit breaker.
Control fuse
o p e n
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
l a t i n g pump not
System Noises
Compressor noisy
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.
bearings)
Check for loose
compressor
down bolts.
Compressor motor
defective
Check motor winding
for open or short.
Replace compressor,
i f
necessary.
Compressor
loses
Seized compressor
Loss of charge control Repair leak;
Compressor
cycles off on toss
of charge
Compressor
shuts down on
high-pressure
control
erratic in action
Low refrigerant charge Add refrigerant.
High-pressure control
Replace control.
erratic in action
Expansion valve
relay contacts.
Check cooler and
Frosted
s u c t i o n l i n e
Compressor discharge
Open
valve,
or
valve partially closed
if defective.
Air in system
Condenser scaled
Purge.
Clean condenser.
Hot
line
Receiver not properly
vented
refrigerant
backs up into evap
condenser
as required,
providing adequate
venting.
Frosted liquid
l i n e
restricted
Restricted
Remove restriction
drier
Condenser water pump
Start pump-
or fans not operating
replace if defective.
Compressor will
not unload
control
Compressor will
not load
control valve
Plugged strainer
side)
Clean or replace
strainer.
Summary of Contents for HS070-160
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