Midea Super DC Series - Page 194

Troubleshooting
Electrical Control System 192
2.4.4.4. E1 malfunction
Current loop communication:
Malfunction
conditions
Indoor unit does not receive feedback from outdoor unit for 110
seconds. This occurs 4 times in a row.
Possible causes
● Wiring mistakes
● Faulty indoor or outdoor PCB
Measure Vs. Is it a positive
fluctuation?
(Vs is the voltage between S and N of
outdoor unit. Red pan-S, Black pan-N.)
Measure Vs. Is it a positive
fluctuation?
(Vs is the voltage between S and N of
outdoor unit. Red pan-S, Black pan-N.)
Yes
Power off, then restart the unit 2 minutes later.
Does a problem still exist?
Power off, then restart the unit 2 minutes later.
Does a problem still exist?
No
Replace the outdoor main PCB.
Power on. Is the error resolved?
Replace the outdoor main PCB.
Power on. Is the error resolved?
Check the outdoor wiring connection. Has
the problem been resolved?
Check the outdoor wiring connection. Has
the problem been resolved?
Replace the indoor main PCB.
Power on. Is the error resolved?
Replace the indoor main PCB.
Power on. Is the error resolved?
Yes
Replace the outdoor main PCB
Replace the outdoor main PCB
No
Replace the indoor main PCB
Replace the indoor main PCB
No
Check the indoor wiring connection
Check the indoor wiring connection
Yes
Yes
Is the reactor
functioning normally?
Is the reactor
functioning normally?
Yes
Replace the reactor
Replace the reactor No