Denso MOVINCOOL Climate pro k18 Service Manual page 18

Troubleshooting Chart
PROBLEM
Poor cooling
Air volume
performance
normal
Air volume
normal
Poor cooling
performance
Air volume
abnormal
Operating near minimum or maximum of
operating temperature range
Dirt in indoor or outdoor heat exchanger
Compressor
Frosting on the refrigerant line caused due
operates
to blockage
Insufficient refrigerant
Low voltage
Capacitor malfunction
See "Inspection of Parts" on page 40
Compressor
does not
Resistance of compressor coil is zero or
operate
infinity due to a short or open circuit
If power supply, capacitor and compressor
are normal, there is a problem with relay
board
Fan motor malfunction
See "Inspection of Parts" on page 41
No air
If fan motor is normal, there is a problem
with relay board
Clogged air filter
Clogged indoor or outdoor heat exchanger
Air volume
Crushed fins
insufficient
Improper duct connection
(Optional accessories)
Abnormal rotation of indoor or outdoor fan
motor
POSSIBLE CAUSE
18
SOLUTION
Review room environment
Clean heat exchanger
Service refrigeration
system
Check for leaks, repair,
and add refrigerant
based on the weight
listed on specifications or
nameplate
Repair power supply
Replace capacitor
Replace compressor
Replace relay board
Replace fan motor
Replace relay board
Clean air filter
Clean heat exchanger
Repair or replace heat
exchanger
Adjust duct connection
Replace fan motor