Daikin 4MXS-R Series Service Manual page 170

Troubleshooting for RA Indoor Unit
Troubleshooting
Check No.04
Refer to P.211
157
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
Start operation.
Does the fan rotate?
NO
Turn off the power and rotate
the fan by hand.
Does the fan rotate
smoothly?
YES
Turn on the power and check the
fan motor voltage. (immediately
after restart)
Voltage as rated? ∗
YES
Check the capacitor's continuity.
Is there continuity?
YES
NO
YES
Check No. 04
Check Hall IC
Is there an output?
NO
YES
Check the fan motor voltage.
Voltage as rated? ∗
YES
∗ Measure the voltage
between the black and white
lead wires of the fan motor,
and check if the maximum
voltage reaches the rated
NO
voltage.
NO
SiUS121736EA
Correct the power supply.
NO
Replace the indoor fan motor or
the indoor unit PCB (control
PCB).
Replace the indoor fan motor.
NO
Replace the indoor unit PCB
(control PCB).
Replace the indoor fan motor.
Replace the indoor unit PCB
(control PCB).
Replace the indoor fan motor.
Replace the capacitor.
(Replace the indoor unit PCB
(control PCB).)
(R22267)
Service Diagnosis