32
Operation Manual - Hercules CP10 Commercial Control Interface
Doc. No. 0525-022
Ver. 5 190314
TROUBLE SHOOTING GUIDE
CONDITION
PROBABLE CAUSE
RECOMMENDED ACTIONS /
CHECKPOINTS
Evaporator coil
freezes up during
low ambient
operation
System low on refrigerant.
System low on airflow.
Outdoor air sensor failure.
Check the pressures and the temps for
suction and discharge.
Check the ID fan airflow through the
Control Interface.
Check the Alarm on the Control
Interface.
Economiser, outside
air and/or spill air
will not operate
Economiser connector not
plugged into unit wiring
harness
Economiser, outside air,
and/or spill air motor has
failed.
Wiring or terminal failure
Check the connection.
Motor wiring to be checked and replaced
as required.
Wiring or terminal to be checked and
replaced as required.
Control Interface
keys not operating
Control Interface hanged.
RJ12 cable failure.
Reset the power to the Control Interface
by turning it OFF/ON.
Replace RJ12 cable through service.
Control Interface
does not power up
Wiring fault.
RJ12 cable fault.
Wiring to be checked as per the wiring
diagram.
Replace RJ12 cable through service.