Troubleshooting; Refrigeration System And Electrical System - Daikin LXE10E-A4 Service Manual

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6. TROUBLESHOOTING

6.1 Refrigeration system and electrical system

If the unit does not work properly, refer to the following table to find causes of trouble and provide
appropriate measures.
State Malfunction occurrence
A. Neither evaporator
fan, condenser fan nor
compressor ran.
B. Evaporator fan rotates, No trouble with unit
but condenser fan and
compressor do not rotate.
C. Condenser fan rotates, Activation of electronic
but evaporator fan and overcurrent protection
compressor do not rotate. device, PT/CT board.
D. Compressor rotates,
but evaporator fan and protection thermostat
condenser fan do not rotate.
E. Compressor buzzes,
but it does not operate.
A. Unit starts but soon
stops
B. Evaporator fan rotates,
but condenser fan and
compressor do not rotate.
C. Condenser fan rotates, q Activation of high-
but evaporator fan and
compressor do not
rotate.
Abnormal point
q No trouble with unit
w Circuit breaker
e UNIT ON/OFF key
r Controller
t Power transformer
Fan motor, actuation of
q Compressor
w Power transformer
Activation of HPS within 30
q
seconds after compressor
starting
Abnormal low pressure
w
drop within 2 seconds
after compressor starting
e
Activation of electronic
overcurrent protection
devices, PT/CT board
r Activation of compressor Overcurrent due to overload operation, etc.
thermal protector
q No trouble with unit
pressure switch
(Air cooled
condenser type)
6-1
Possible cause
Power failure
Equipment power supply: OFF
Disconnection of power plug
Poor contact of power plug
Circuit breaker: OFF
Solenoid valve coil burned out or short circuit
Contactor coil burned out or short circuit
Short circuit of wiring inside unit
OFF or malfunction
Wire breakage in the control circuit transformer
Fuse (10A) burned out
Open phase (R or T)
Shut down due to alarm generation
Wire breakage or open phase
ON/OFF control with frozen mode
(Inside temperature is lower than SP.)
Overcurrent due to overload operation, etc.
Fan locked by foreign material
Not-closing of protection thermostat contact
point
Open phase
Lock
Low supply voltage
Motor coil burned out or short circuit
Power transformer malfunction
High-pressure switch malfunction
Liquid solenoid valve: closed
Electronic expansion valve: closed
Overcurrent due to overload operation, etc.
In ON-OFF control operation with frozen mode
Refrigerant overcharge
Air entering in the refrigerant system
Insufficient air flow rate in the air cooled condenser
Condenser finned coil blocked
Air passage blocked by foreign material
Broken blade of condenser fan
Condenser fan motor rotation failure
Activation of condenser fan motor thermal protector