Error code reference

Amana Furnace Error Code 3 Flashes

Pressure switch stuck open - pressure switch circuit does not close in response to induced draft blower operation.

SourceAmana 40" 80%/90% Gas Furnaces - Service Manual (GUIA/GCIA/GUIB/GCIB Series)p. 77, 80, 92, 101, 107, 113

Diagnostic procedure

The full 3 Flashes 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 and correct pressure switch hose; check flue and/or inlet air piping for blockage, proper length, elbows and termination; check drain system.

SourceAmana 40" 80%/90% Gas Furnaces - Service Manual (GUIA/GCIA/GUIB/GCIB Series)p. 77, 80, 92, 101, 107, 113

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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 Amana furnace.

Models covered by the manuals that document this code

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The full 3 Flashes procedure

Where this code is documented

Models covered by the manuals that document this code

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