32 Specifications subject to change without notice. SG-38MHRC-01
DIAGNOSIS AND SOLUTION (CONT)
Indoor and Outdoor Unit Communication Error (E1)
Description: The indoor/outdoor unit communication
Possible causes:
• Wiring mistake
• Faulty Indoor or outdoor PCB
Troubleshooting:
For certain models, outdoor PCB could not be removed separately. In this case, the outdoor electric control box should be replaced as a whole.
Measure Vs., is it a positive fluctuation?
(Vs represents the S and N voltage of the
outdoor unit. Red pan-S, Black pan-N)
Power off, then restart the unit 2 minutes later.
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
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