Daikin 4MXL-T Series Service Manual page 205

SiUS121827E
Troubleshooting
Part 6 Service Diagnosis
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Check the power supply voltage.
Is the
voltage fluctuation
within ±10% from the rated
value?
YES
Check the connection of the
compressor harness.
Loose or
disconnected?
NO
Does the
outdoor fan rotate smoothly?
YES
(Precaution before turning on the power again)
Make sure the power has been off for at
least 30 seconds.
Turn on
the power. System
restarted? (Repeat a few
times.)
NO
Error again
within 3 minutes after
turning on the power?
YES
NO
YES
NO
YES
Disturbance factors
∗ Noise
∗ Power supply distortion
NO
Troubleshooting for Outdoor Unit
Correct the power supply.
Reconnect the harness.
Replace the outdoor fan motor
and the outdoor unit PCB
(main PCB).
Check for such factors for a
long term.
Replace the outdoor
unit PCB (main PCB).
Replace the indoor
unit PCB (control PCB).
(R22370)
199