Johnson Controls HVWHP072B32S - Page 80

3-60
SM-18006
TROUBLESHOOTING
Excessively High
Discharge Gas
Temperature
(at Top of
Compressor)
Is thermistor correctly
installed?
Check resistance
of thermistor.
Faulty
Discharge
Gas
Thermistor
Failure
Replace thermistor
if faulty.
Correctly install it.
Incorrect
Installation
Check connection.
Tighten, replace
connectors or
repair connection.
Incorrect
Wiring
Check connection.
Replace W.S. PCB and
check operation.
Faulty
W.S. PCB
Failure
Replace W.S. PCB
if faulty.
Repair wiring
connection.
Disconnected
Wires for
Expansion
Valve
Check pressures.
Charge correct amount
of refrigerant.
Undercharge of Refrigerant
Check expansion valve.
Replace expansion valve
if faulty.
Faulty Expansion Valve
Cause Check Item
Action
(Turn OFF Main Switch)
Event
Check refrigerant piping
and communication
cable.
Repair cable correctly.
Refrigerant piping and
communication cable do not
match the same refrigerant
system group.
(Refer to Section 4.2.1.7.)