Daikin BPMK928B42, Service Manual

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Si18-201 Troubleshooting - Outdoor Unit Related
Service Diagnosis 273
3.3.11 Operation Halt Due to Detection of CT Error
Outdoor Unit
Indication
H8
Method of
Malfunction
Detection CT errors are detected using the compressor’s operating frequency and the input current
detected by the CT.
Malfunction
Decision
Conditions When the compressor’s rotating speed is 64rps or more and the CT input is 2 A or less.
"
When a CT error is generated 4 times, the system shuts down.
(The 4-time counter resets itself when no outdoor unit abnormality occurs within 60 minutes
(cumulative time) after the error generation.)
Supposed
Causes
"
Incorrect connectors connection
"
Faulty thermistor
"
Faulty power transistor
"
Breaking of wire or faulty connection of internal wiring
"
Faulty reactor
"
Faulty PCB
Troubleshooting
Check No.11
Refer to P.307
Check No.5
Refer to P.302
Turn the power on again to
re-start the equipment.
YES
Replace the outdoor unit
PCB.
(Control PCB, Filter PCB)
Correct the internal wiring.
Replace the compressor.
Replace the outdoor unit
PCB.
(Control PCB, Filter PCB)
Is the current
less than 2.00A?
Is it normal?
(MF030)
NO
YES
NO
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Check No. 11
Input current measurement
Check No. 5
Internal wiring check (1)
Is it normal?
NO
Check the conductivity of the
compressor coil.
YES