46
Trouble shooting
Description
Possible cause
Check
Power failure
faulty or disconnected
fuse
Check the mains supply phases
and active/replace fuse
Mains fault, voltage
fluctuations
notify your electricity supplier
Compressor has no
sound, no action
wrong phase sequence
check phase sequence protector
Thermal relay has
tripped
Check thermal relay and
active/re set thermal relay
A/C contactor has not
closed
Check A/C contactor
Compressor internal
thermal protection
wait until compressor cool
down
controller trouble
check controller compressor
signal Q14,Q24 output
Compressor make a
sound but no action
Compressor high/low
pressure not balanced
check HP and LP readings
Voltage is too low
check voltage
Low starting voltage
(single phase)
check start capacitor,
soft-starter
Compressor broken or
stuck
check compressor windings
Compressor can not
stop
A/C contactor stuck
replace
controller trouble
check controller compressor
signal Q14/Q24 output
Unit heating/cooling
efficiency is low
heat exchanger is
contaminated
clean
gas filling not enough
check and add gas
compressor trouble
replace
Trouble Shooting
