Daikin LX10F10A, Service Manual

Page: 74 / 126

Symptom Cause Checkpoint Remedy
Ⅲ
Inside temper
ature does not drop
.
The low pressure is
excessively low. Faulty opening of
electronic expansion
valve (EEV)
NO
Normal
Normal
Normal
NO
Is suction
and discharge air reversed
when the ventilator
is opened?
Is the DCHS
sensor installed
inappropriately?
Faulty resistance
of electronic expansion valve
coil (46 Ω /phase)
YES (Inappropriate)
NO (Normal)
Correct installation of
sensor
YES (Inappropriate)
Replace the electronic
expansion valve coil.
Reset opening of EEV
(Circuit breaker ON)
Is pull-down possible?
Is pull-down possible?
NO (Fan rotates normally)
Check the wiring of magnetic
contactor for evaporator fan.
YES (Fan rotates reverse)
Is the current
at evaporator fan motor 0?
(on the secondary side of
magnetic contactor)
Replace the fan motor.
Install the propeller fan.
Is pull-down possible?
NO (Normal)
NO
YES
Open the access
panel and check if the evaporator
fan blade is removed.
YES
YES
YES
YES
Manual defrost
Replacing electronic expansion
valve body
Replacing drier.
NO
NO
NO
Low air volume
(frosted evaporator)
Low air volume
(reverse rotation of
evaporator fan)
Low air volume (stop
of evaporator fan)
Low air volume (drop
of propeller fan)
Displacement of
discharge pipe
temperature sensor
DCHS (detection of
wet operation).
Faulty electronic
expansion valve coil
Entering of water in
refrigerant system
Water choke
2-49