Carrier DHMVHAQ24XA3 - Indoor; Outdoor Unit Communication (EL01)

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DIAGNOSIS AND SOLUTION (CONT.)
Indoor / Outdoor Unit Communication (EL01)
Troubleshooting
Error Code EL01
Malfunction decision conditions
Indoor unit does not receive feedback from the outdoor unit for 110 seconds and this issue occurs four
times continuously
Supposed causes
Wiring mistake
Indoor or outdoor PCB Faulty
Measure Vs., is it a positive fluctuation?
(Vs represents the voltage S and N of the
outdoor unit. Red pin-S, Black pin-N)
Power off and wait 2 minutes. Restart the unit.
Replace the indoor main PCB.
Power on. Is the error resolved?
No
Check the indoor wiring connection.
Yes
Check whether the
reactor is normal.
Yes
No
Check the outdoor wiring connection.
Replace the reactor.
Yes
Replace the outdoor main PCB.
Power on. Is the error resolved?
Replace the indoor main PCB.
No
Replace the outdoor main PCB.
Yes
No
Yes
Yes