Midea CS11M-18HRFN1-MT0W

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9.3.2 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
110 seconds and this condition happens four times continuously.
Supposed causes
● Wiring mistake
● Indoor or outdoor PCB faulty
Trouble shooting:
Measure Vs. Is the voltage moving
alternately between -25V to 25V?
Measure Vs. Is the voltage moving
alternately between -25V to 25V?
Yes
Power off, then restart the unit 2 minutes later.
Is the error extinguished?
Power off, then restart the unit 2 minutes later.
Is the error extinguished?
No
Replace the outdoor main PCB.
Power on. Is the error
extinguished?
Replace the outdoor main PCB.
Power on. Is the error
extinguished?
Check the outdoor wiring connection。
Is the wiring correctly?
Check the outdoor wiring connection。
Is the wiring correctly?
Replace the indoor main PCB.
Power on. Is the error
extinguished?
Replace the indoor main PCB.
Power on. Is the error
extinguished?
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。
Is the wiring correctly?
Check the indoor wiring connection。
Is the wiring correctly?
Yes
No
Check whether reactor
is normal?
Check whether reactor
is normal?
Yes
Replace the reactor
Replace the reactor No