Carrier DHMVHA Service Manual page 19

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DIAGNOSIS AND SOLUTION (CONT.)
Fan Speed is Operating Outside of the Normal Range (EH03)
Error Code
Malfunction decision conditions
Supposed causes
Troubleshooting
Power off, then restart the
unit 2 minutes later
Shut off the power supply,
Rotate the fan by hand.
Check the fan motor wiring
Measure the voltage for the
fan motor from the main
Replace the fan motor
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
EH03
When the indoor fan speed remains too low (300RPM) for a certain period of time, the unit stops and the
LED displays the failure.
Wiring mistake
Fan assembly faulty
Fan motor faulty
PCB faulty
Yes
Yes
Yes
PCB
Yes
No The unit operates normally.
No
Find the cause and resolve it.
Correct the connections.
No
No Replace the main PCB
No
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