Daikin LX10F11B3 Service Manual page 78

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Symptom
The low pressure is Low air volume
excessively low. (frosted evaporator)
Low air volume
(reverse rotation of
evaporator fan)
Evaporator fan motor
failure
Low air volume
(Fan blade removed)
Improperly discharge
pipe temperature
sensor DCHS1,2
(detection of wet
operation).
Faulty electronic
expansion valve coil
Entering of water in
refrigerant system
Cause
Can the setting temperature
and discharge air reversed
and coil resistance values for
panel and check if the evaporator
of electronic expansion valve
Can the setting temperature
2-49
Checkpoint
Manual defrost
NO
YES
be reached?
NO
Is suction
YES (Fan rotates reverse)
when the ventilator
is opened?
NO (Fan rotates normally)
Are the current values
YES
each evaporator fan motor
abnormal?
NO
Open the access YES
fan blade is removed.
NO
Is the DCHS1, 2 YES (Inappropriate)
sensor installed
improperly?
NO (Normal)
YES (Inappropriate)
Faulty resistance
coil (46Ω/phase)
NO (Normal)
YES
be reached?
NO
Replacing electronic
expansion valve body
and replace dryer.
Remedy
Normal
Check the wiring of magnetic
contactor for evaporator fan.
Replace the evaporator
fan motor.
Install the propeller fan.
Correct installation of
sensor
Replace the electronic
expansion valve coil.
Normal