18
Communication malfunction between indoor and outdoor units diagnosis and solution (E1)
Error Code E1
Malfunction decision conditions
Indoor unit does not receive the feedback from outdoor unit during 110 seconds and this
condition happens four times continuously.
Supposed causes
S Wiring mistake
S Indoor or outdoor PCB faulty
(Vs is the voltate between S and L2 of the
outdoor unit. Red Probe on S
& Black Probe on N
Power o, then restart the unit 2 minutes later.
Check the outdoor wiring connection.
Check whether
the reactor is normal.
Replace the reactor.
Replace the outdoor main
PCB. Power ON. Is the error
corrected?
Replace the indoor main PCB.
Check the indoor wiring connection.
Replace the indoor main PCB. Power
on. Is the error corrected?
Replace the outdoor main PCB.
Fig. 23 – Troubleshooting
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