Midea MSMA1A-09HRN1 - Indoor;Outdoor Communication Error Troubleshooting

Blanc On-off DM16-01.01.07en
50 Service manual
11.2.2 Indoor / outdoor unit’s communication diagnosis and solution (E1)
Error Code
E1
Malfunction decision
conditions
Indoor unit does not receive the feedback from outdoor unit during
120 seconds.
Supposed causes ● Wiring mistake
● Indoor or outdoor PCB faulty
Trouble shooting: