Error code reference

Maytag Microwave Error Code Err4

Failed H.V. Board, Shorted Touch Panel, or Wrong jumper setting.

SourceMaytag Commercial Microwave - Tech Sheet: AMH20, JBH20p. 10

Diagnostic procedure

The full Err4 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

Replace H.V. Board; check Touch Panel; check cable to H.V. Board.

SourceMaytag Commercial Microwave - Tech Sheet: AMH20, JBH20p. 10

Unlock with pass

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

30 manuals in the MyPros+ library document this code for Maytag microwave.

Models covered by the manuals that document this code

More models are covered than are listed here.

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The full Err4 procedure

Where this code is documented

Models covered by the manuals that document this code

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