Error code reference

Midea Air Conditioner Error Code E4

Communication malfunction between main control board and display board (no feedback received within 120 seconds).

SourceMidea PTAC Air Conditioner - Service Manual: 7,000-15,000 BTU/hp. 18, 30

Diagnostic procedure

The full E4 procedure

Step 1 is visible so you can confirm you are on the right page. The remaining steps, the ones that tell you whether to actually replace a part, unlock with any pass.

MyPros+ · DiagnosticsStep 1 preview

First diagnostic step

Check signal wire between the display board and main board for proper connection.

SourceMidea PTAC Air Conditioner - Service Manual: 7,000-15,000 BTU/hp. 18, 30

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More steps, wiring diagram references, and verified part numbers

Includes expected resistance and voltage values, connector pinouts, and supersession notes for replacement parts.

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Where this code is documented

1 manual in the MyPros+ library documents this code for Midea air conditioner.

Models covered by the manuals that document this code

MP12HMB63

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The full E4 procedure

Where this code is documented

Models covered by the manuals that document this code

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