Si20-701_B Troubleshooting by Remote Controller
460
Check for Fan Motor Connector (Power Supply Line)
(1) Turn the power supply OFF.
With the relay connector disconnected, measure the
resistance between UVW phases of the connector (3
cores) at the motor side, then make sure that the
resistance between each phase is balanced and not
short-circuited.
Checking the Thermistors
If the cause of the problem is related to the thermistors,
then the thermistors should be checked prior to changing
the PCB.
To check the thermistors, proceed as follows:
Step Action
1 Disconnect the thermistor from the PCB.
2 Read the temperature and the resistor value.
3
Check if the measured values correspond with the values in
the table on the next pages.
CHECK 2
Red
White
Black
U
V
W
Measure the resistance between
each phase.
CHECK 3
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