Midea M-Thermal Series Service Manual page 54

4.9 H0 Troubleshooting
Digital display output
Description
 Communication error between outdoor unit and hydronic box.
 M‐Thermal Split stops running.
 Error code is displayed on hydronic box main PCB, outdoor unit main PCB and user interface.
Possible causes
 Power supply abnormal.
 Transformer malfunction.
 Interference from a source of electromagnetic radiation.
 Outdoor unit main PCB or hydronic box main PCB damaged.
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M‐Thermal Split