Midea HB-A100/CGN8-B, Service Manual

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M thermal Split
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4.4 E2 Troubleshooting
Digital display output 4.4.1
Description 4.4.2
Communication error between hydronic box and user interface.
M thermal Split stops running.
Error code is displayed on hydronic box main PCB and user interface.
Possible causes 4.4.3
Communication wires between hydronic box and user interface not connected properly.
Communication wiring X Y E terminals misconnected.
Loosened wiring within electric control box.
Interference from high voltage wires or other sources of electromagnetic radiation.
Damaged main PCB or electric control box communication terminals block.
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