Indoor Fan Speed Has Been Out Of Control E3 - Carrier 42QZA009DS-1 Service Manual

18.3.1.3 indoor unit fan speed has been out of control
Power off, then restart the
Power off, then restart the
unit 2 minutes later. Is it still
unit 2 minutes later. Is it still
displaying the error code?
displaying the error code?
Yes
Shut off the power supply,
Shut off the power supply,
rotate the fan by hand. Does
rotate the fan by hand. Does
it rotate properly?
it rotate properly?
Yes
Check the wiring of fan
Check the wiring of fan
motor. Are all the
motor. Are all the
connections good?
connections good?
Yes
Check whether the main PCB
Check whether the main PCB
is normal through index 1?
is normal through index 1?
Yes
Replace the fan motor
Replace the fan motor
Index 1:
1: Indoor AC fan motor
Power on and set the unit running in fan mode at high fan speed. After running for 15 seconds, measure the
voltage of pin1 and pin2. If the value of the voltage is less than 100V(208~240V power supply)or 50V(115V
power supply), the PCB must have problems and need to be replaced.
2. Indoor DC fan motor(control chip is inside fan motor)
Power on and when the unit is in standby, measure the voltage of pin1-pin3, pin4-pin3 in fan motor
connector. If the value of the voltage is not in the range showing in below table, the PCB must have
problems and need to be replaced.
For other models:
No The unit operates normally.
The unit operates normally.
Find out the cause and
Find out the cause and
have it solved. For
have it solved. For
example,
example,
No
is blocked or the screws
is blocked or the screws
which fix the fan are
which fix the fan are
No Correct the connections.
Correct the connections.
No Replace the main PCB
Replace the main PCB
No
71
whether the fan
whether the fan
tighten.
tighten.