Midea M-Thermal Series Service Manual page 45

M‐Thermal Split
4.3 E2 Troubleshooting
Digital display output
Description
 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
 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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