6 - 6
6-6. Troubleshooting
No.
Failures
Cause
Actions
1
Fan motor does not turn.
Fuse blown.
Check and replace.
Wiring cut off and poor
connection.
Repair the wiring or
connect right.
Failure of fan motor.
Replace.
Resistor, relay and switch
cut off.
Replace.
2
Fan motor is normal but the air
volume is small.
Evaporator or heater core
was clogged.
Remove the obstacles
and clean the cores.
Duct was misaligned.
Repair the duct.
Fan damaged or Fan motor
failure.
Replace.
Filter was clogged.
Clean or replace.
3
Air
conditioning
is insufficient
despite of
the normal
operation of
compressor
and blower.
Low and high
pressure is low.
Leakage of refrigerant.
Contact the dealer.
Low and high
pressure is high.
Refrigerant overcharged.
Contact the dealer.
Condenser or radiator
screen was clogged.
Clean condenser and
the screen.
Air is in air conditioning line.
Contact the dealer.
Expansion valve does not
control the refrigerant flow.
Contact the dealer.
Low pressure is
high, high
pressure is low.
Compressor leakage.
Contact the dealer.
Low pressure is
vacuum
intermittently.
Water is in air conditioning
line.
Contact the dealer.
Low pressure is
vacuum, high
pressure is low.
Receiver dryer, pipe or
expansion valve is clogged.
Contact the dealer.
