York YHKE09XEEAMH-RX Service Manual page 39

9.2.3 Fan speed has been out of control diagnosis and solution(E3)
Error Code
Malfunction decision
conditions
Supposed causes
Trouble shooting:
Shut off the power supply
and turn it on 2 minutes
later. Is it still displaying
the error code?
Yes
Shut off the power supply,
rotate the fan by hand.
Does it rotate properly?
Yes
Check the wires of fan
motor. Are all the
connections good?
Yes
Check whether the main PCB is
normal through index 1?
Yes
Replace the fan motor.Is the error
extinguished?
E3/F5
When indoor fan speed keeps too low (300RPM) for certain time,
the unit will stop and the LED will display the failure.
Wiring mistake
●
Fan ass'y faulty
●
Fan motor faulty
●
PCB faulty
●
No
No
No
No
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?
Correct the connections.
Replace the main PCB
No
37