Fan Motor (Ac Motor) Or Related Abnormality - Daikin 2MXS-N Series Service Manual

SiUS121502E
6.3

Fan Motor (AC Motor) or Related Abnormality

A6
Error Code
Method of Error The signal from the fan motor detects abnormal fan speed.
Detection
Error Decision The fan rotations are not detected while the output voltage to the fan is at its maximum.
Conditions
Supposed
Causes
Troubleshooting
Note: 1. Check the connector of fan motor. (Power supply cable)
2. Turn OFF the power supply.
3. Measure the resistance between the terminals at the motor side connectors to check that there
Service Diagnosis
Disconnection, short circuit or disengagement of connector in fan motor harness
Defective fan motor (disconnection, poor insulation)
Abnormal signal from fan motor (faulty circuit)
Defective indoor unit PCB
Momentary fluctuation of power supply voltage
Fan motor lock (Caused by motor or other external factors)
Fan does not rotate due to tangled foreign matters.
Be sure to turn off the power switch before connecting or disconnecting
Caution
connectors, or parts may be damaged.
Turn off the power supply.
Is there any
foreign matter around
the fan?
NO
Is the
harness from the
fan motor correctly
connected to the
indoor unit
PCB?
YES
Check the fan motor
connector. (See the Note.)
Is there
short circuit between
the terminals?
YES
is no short circuit, while the connector is disconnected.
(1) Red
(2) White
(3) Black
(R18060)
YES
NO
NO
Measuring points
(1) - (3)
(2) - (3)
Troubleshooting for FFQ Series
Remove the foreign matter.
Connect the connector (X20A)
correctly.
Replace the indoor fan motor.
Replace the indoor unit PCB
(control PCB).
(R22269)
Resistance for judgement
88.2 Ω ± 10%
85.5 Ω ± 10%
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