37
Troubleshooting Issues – Split System Configuration Only
Issue Possible
Causes
Potential
Solutions
No cooling: no refrigerant flow.
If the "snowflake" icon is
illuminated on the
temperature display control,
the optional liquid line
solenoid should be
energized and the
compressor running.
No power to liquid
solenoid valve coil
(valve control)
Power supply to Evaporator interrupted. Restore
power.
Power supply to solenoid coil interrupted: loose
wire. Inspect for loose fan wiring and reconnect.
Solenoid coil
failure
(valve
control)
When the Evaporator is powered on and off, a
distinct "click" should be heard indicating the
opening/closing of the solenoid valve. If not, the
solenoid coil may need to be replaced. Consult
factory.
No power to
compressor
Power supply to Condensing Unit interrupted.
Restore power.
Check for loose wires and reconnect.
Low pressure switch is open: make sure solenoid
is energized and condensing unit service valves
are open. Jumper out switch to check for a faulty
switch, and replace if necessary. Note that in
installations below 0°F this switch may remain
open. Valve Option only. Consult factory.
High pressure switch is open: make sure
condensing unit service valves are open. If this
does not correct the problem, refer to the "High
Pressure Safety Shutdown" section.
High pressure
safety shutdown /
high discharge
pressure
Locate and correct source of high condensing
head pressure:
Refrigeration line blockage
Condenser fan not operating in ambient
temperatures above 90°F. Ensure that there is
power to the Condensing Unit and verify the fan
cycling control settings (optional item). Replace
condenser fan and fan cycling control if
Insufficient ventilation: reference Condensing
Unit installation guidelines for proper placement
and ambient temperature requirements. Correct
to ensure adequate air ventilation to and from the
Condensing Unit.
Improper refrigerant charge: inspect for over-
charged system or non-condensibles in system.
Dirty or obstructed condenser coil: clean and
remove all obstructions to airflow.
Intermittent power
to compressor
Check for loose wires and secure.
Compressor cycling on internal thermal overload
protection. Replace start capacitor/relay
assembly
Compressor cycling on high pressure - see "High
pressure safety shutdown" section.
Faulty compressor. Consult factory.
