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4 --- Fan speed out of control --- diagnosis and solution (E3)
Error Code
E3
Malfunction conditions
When the indoor fan speed has been too low (300RPM) for certain time, the unit will stop and the
LED will display the failure.
Possible Causes
• Wiring mistake
• Defective fan assembly
• Defective fan motor
• Defective PCB
Trouble shooting:
Shut off the power supply
and turn it on 5 seconds
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 resolved.
.
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.
Is the
malfunction
resolved?
No
No
If the
malfunction is
still existing,
replace the
main PCB
No
A14483
Index 1:
Indoor fan motor
Measure the resistance value of each winding by using the tester.
For the definite value of the resistance, refer to Appendix A5 and
A6.
Index 2:
Indoor fan motor
Power on and set the unit running in fan mode (at high fan speed).
After it has been 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 needs to be replaced.
A14484
