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Chillers
TurboChill™ R1234ze Air Cooled and FreeCool
152
Chiller Technical Manual 7752785 V1.12.0_10_2018
Troubleshooting
Fault
Possible Cause
Remedy / Action
General
Unit will not start
No power.
Check power supply to the controller.
Wired incorrectly.
Check wire connections in accordance
with wiring diagram.
Loose wires.
Check all wires, connections, terminals etc.
Remote on/off.
Check that the remote on/ off
is at the on position.
Refrigeration
Compressor not
operating
No power to compressor.
Check isolator, fuses, MCBs, contactor
and control circuit wiring.
Low pressure cut-out operated (large
or complete loss of refrigerant charge).
Recover refrigerant, repair, pressure
test, evacuate and recharge system.
Compressor showing
fault on controller.
Determine fault, refer to alarm
codes for further information.
Head pressure too high
/ HP cut-out operated
Condenser coil clogged or dirty.
Clean condenser.
Overcharge of refrigerant. Normally
troublesome in warm weather.
Remove excess refrigerant from system using
correct refrigerant handling techniques.
Air or other non-condensable
gas in system.
Evacuate system and re-charge
with new refrigerant.
Head pressure controller faulty.
Check EC fan control module - if faulty - replace.
Fan not operating or
operating inefficiently.
Check motor - if faulty - replace.
Head pressure too low
Fan operating too fast in
low ambient conditions.
Check EC fan control module - if faulty - replace.
Suction pressure
too low
Flash gas (bubbles in sight
glass) at liquid line.
Investigate for refrigerant leaks, repair, pressure
test, evacuate and re-charge system.
Clogged filter drier (pressure /
temperature drop across it).
Replace drier cores.