33
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
