Daikin J Series Service Manual page 121

SiBE041012
5.1.7 Outdoor Fan System Check
Check No.09 DC motor
5.1.8 Power Supply Waveforms Check
Check No.10 Measure the power supply waveform between No. 1 and No. 2 on the terminal board, and check
the waveform disturbance.
Fig.1
5.1.9 Inverter Units Refrigerant System Check
Check No.11
Service Diagnosis
Check the outdoor fan system.
Outdoor fan running?
YES
Outdoor fan system is functioning.
Check to see if the power supply waveform is a sine wave. (Fig.1)
Check to see if there is waveform disturbance near the zero cross. (sections circled in Fig.2)
Refrigerant system check
Is the
discharge
pipe thermistor
disconnected from the
holder?
NO
Check for refrigerant leakage.
See the service diagnosis on
refrigerant shortage (U0).
Fan motor
NO
lead wire connector
disconnected?
NO
Go to Check No. 15.
Fig.2
YES
Check
YES
Reconnect the connector.
(R7159)
Place the thermistor.
Replace the refrigerant.
(R8259)
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