Carrier DHMVHA Service Manual page 16

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DIAGNOSIS AND SOLUTION (CONT.)
Indoor / Outdoor Unit Communication (EL01)
Error Code
Malfunction decision conditions
Supposed causes
Troubleshooting
Replace the reactor.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
EL01
Indoor unit does not receive feedback from the outdoor unit for 110 seconds and this issue occurs four
times continuously
Wiring mistake
Indoor or outdoor PCB Faulty
Power off and wait 2 minutes. Restart the unit.
Yes
Measure Vs., is it a positive fluctuation?
(Vs represents the voltage S and N of the
outdoor unit. Red pin-S, Black pin-N)
Yes
Check the outdoor wiring connection.
Yes Yes
Check whether the
No
reactor is normal.
Yes
Replace the outdoor main PCB.
Power on. Is the error resolved?
No
Replace the indoor main PCB.
Check the indoor wiring connection.
Replace the indoor main PCB.
Power on. Is the error resolved?
Replace the outdoor main PCB.
16
No
Yes
No