Carrier 42QFD048D8S Service Manual page 94

TS04-ODU: The outdoor fan speed is operating outside of normal range diagnosis and
solution)
Description: When outdoor fan speed keeps too low or too high for a certain time, the LED displays the failure code
and the AC turns off.
Recommended parts to prepare:
• Connection wires
• Fan assembly
• Fan motor
• Outdoor main PCB
Troubleshooting and repair:
Power off, then restart the unit after 2 minutes.
Shut off the power supply, Rotate
Check the wiring of fan motor.
the fan motor from the PCB.
Is it within normal parameters?
Replace the DC fan IPM board (if
Note: For certain models, outdoor PCB could not be removed separately. In this case, the outdoor electric
control box should be replaced as a whole.
Does a problem remain?
YES
the fan by hand.
Does it turn easily?
YES
Is it improperly wired?
YES
Measure the voltage for
YES
has)
Replace the fan motor

NO The unit is operating normally
NO Find the cause of the problem and resolve it
Ensure proper connections
NO Replace the outdoor main PCB
Troubleshooting 