E3/F5(Fan Speed Is Operating Outside Of The Normal Range) - Carrier 42QHP09E8S Service Manual

5.4

E3/F5(Fan speed is operating outside of the normal range)

Description: When the indoor fan speed keeps too low (300RPM) or too high (1500RPM) for certain time, the unit will
stop and the LED will display the failure(E3). When the outdoor fan speed registers below 200RPM or over 1500RPM for
an extended period of time, the unit will stop and the LED will display the failure(F5).
Recommended parts to prepare:
• Wiring mistake
• Faulty fan assembly
• Faulty fan motor
• Faulty PCB
Troubleshooting and repair:
Power off, then restart the unit after 2 minutes.
Does a problem remain?
Shut off the power supply, Rotate
Does it turn easily?
Check the wiring of fan motor.
Is it improperly wired?
Measure the voltage for
the fan motor from the PCB.
Is it within normal parameters?
Replace the fan motor
 Page 64 
YES
the fan by hand.
YES
YES
YES
NO The unit is operating normally
NO Find the cause of the problem and resolve it
Ensure proper connections
Replace the indoor/outdoor
NO
PCB