Carrier HS070-160 - Manual (Page 26)

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.