Troubleshooting Chart - Denso MovinCool CLIMATE PRO K63 Service Manual

Troubleshooting Chart

PROBLEM
No display on LCD screen
Unit does not
operate
LCD display is normal, but
unit does not start
Unit stops
immediately LCD display is normal
after starting
Unit stops
after running LCD display is normal
for a while
POSSIBLE CAUSE
Power failure
Phase sequence is reversed
Ground fault protective breaker is tripped
Defective ground fault protective breaker
Power cord is damaged
Transformer malfunction
See "Inspection of Parts" on page 83
Reverse phase relay malfunction
See "Inspection of Parts" on page 83
Ambient temperature has reached set
temperature and unit has stopped
Fan motor malfunction
See "Inspection of Parts" on page 79
Compressor malfunction
See "Inspection of Parts" on page 81
If fan motor and compressor are normal,
there is a problem with relay board
Operating near minimum or maximum of
operating temperature range
Dirt in indoor or outdoor heat exchanger
Insufficient refrigerant or refrigerant leak
18
SOLUTION
Fix power supply and
check for proper phase
connection
Change any 2 of the 3
wires for power source
wires
Reset breaker
Repair or replace breaker
Replace power cord
Replace transformer
Replace reverse phase
relay
Adjust set temperature
Replace fan motor
Replace compressor
Replace relay board
Review room environment
Clean heat exchanger
Repair leak and add
refrigerant based
on the weight listed
on specifications or
nameplate