Service manual

45
Installation and Service Manual
TROUBLESHOOTING
PROBLEM ANALYSIS GUIDE - 3 RELAY BOARD
Problem
Circuit board indicator
lights "on"
Cause
Compressor does not run:
A) Check circuit board relay
B) Check contactor
C) Compressor overload open
D) Check compressor and start
components
Compressor runs, does not cool:
A) Low charge
B) Hot gas solenoid leaking
C) Defective expansion valve
D) Inefficient compressor
E) Internal by-pass open, com-
pressor noisy
Corrective Action
Replace if defective
Replace if defective
Permit overload to cool and reset
or replace
Replace as required
Leak check - recharge
Replace
Replace
Replace
Permit pressures to equalize
Problem
Cuber remains in freeze cycle
Cause
Evaporator Thermistor:
A) Check thermistor
Evaporator thermistor shorted:
A) Check lead wire connections
B) Check thermistor
Ice bridge setting too thick
Expansion valve failure -
(will not pull down)
Corrective Action
Replace - see check out
Seperate
Replace
Adjust per bridge adjustment in-
structions
Tighten bulb - replace if required -
see check out