Airwell johnson JOAU-ZCY218-H11, Service Manual

Page: 103 / 124

Troubleshooting
Electrical Control System 103
2.4.1.3 indoor unit fan speed has been out of control
Shut off the power supply
and turn it on 1 minute
later. Is it still displaying
the error code?
Shut off the power supply,
rotate the fan by hand.
Does it rotate properly?
The unit operates normally.
Find out the cause and
have it solved. For
example, check
whether the fan is
blocked or the bearing
is broken?
Check the wires of fan
motor. Are all the
connections good?
No
Yes
No
Correct the connections. No
Yes
Check whether the main PCB is
normal through index 2?
Yes
Yes
Check whether the fan
motor is normal through
index 1?
Yes
Replace the fan
motor
Replace the
main PCB.
The
malfunction is
solved?
No
No
If the
malfunction is
still existing,
replace the
main PCB
No
Index 1:
1.Indoor AC fan motor
Measure the resistance value of each winding by using the tester.
For the definite value of the resistance, refer to 2.4.3 Main parts check .
2.Indoor DC fan motor(control chip is inside fan motor)
Measure the resistance value of each winding by using the tester. If any resistance value is zero, the fan
motor must have problems and need to be replaced.