Outdoor Fan System Check; Power Supply Waveforms Check - Daikin FTXL20G2V1B Service Manual

Check

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.
„ 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)
Fig.1
5.1.9 Inverter Units Refrigerant System Check
Check No.11
122
Check the outdoor fan system.
Outdoor fan
running?
YES
Outdoor fan system is functioning.
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 lead
NO
wire connector disconnected?
NO
Go to Check No. 15.
Fig.2
YES
SiENBE04-925_A
YES
Reconnect the connector.
(R7159)
Place the thermistor.
Replace the refrigerant.
(R8259)
Service Diagnosis