Daikin J Series Service Manual Page 247

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Troubleshooting - Outdoor Unit Related SiE18-201
236 Service Diagnosis
3.3.24 Electronic Thermal
Outdoor Unit
Indication
L8
Method of
Malfunction
Detection
Electronic thermal is detected using output amperage and operating status.
Malfunction
Decision
Conditions
When the compressor output current of 40A or higher continued for 260 seconds
When the compressor output current of 50A or higher continued for 5 seconds
When an electronic thermal error is generated 4 times, the system shuts down.
(The 4-time counter resets itself when no outdoor unit abnormality occurs for 60-minute
cumulative time after the error generation.)
Supposed
Causes
Incorrect connectors connection
Faulty thermistor
Faulty power transistor
Disconnection·Faulty connection of internal wiring
Faulty reactor
Faulty compressor
Faulty PC board
Troubleshooting
Check No.5
Refer to P.251
Check No.6
Refer to P.252
Check No.7
Refer to P.253
Check No.1
Refer to P.249
Check No.2
Refer to P.249
Check No. 5
Main circuit wiring
connection check
NO
Replace control PC board.
Apply required remedy
subject to the case.
Apply required remedy
subject to the case.
Apply required remedy
subject to the case.
When halting,
does the current stated
above?
(MF043)
YES
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Check output current
(Measure motor current of
U,V,W with use of clamp meter.)
Check No. 6
Power transistor check
Check No. 7
Power transistor output check
OK
Check No. 1
Installation conditions check
OK
Check No. 2
Discharge pressure check
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