Error code reference

Carrier Furnace Error Code 31

Pressure switch did not close or reopened; if open longer than 5 minutes, inducer shuts off for 15 minutes before retry.

SourceCarrier 58DLA/DLX Furnace - Service Manual: Installation & MaintenanceFig. 55 / Service Label

Carrier codes Carrier furnace codes

Diagnostic procedure

The full 31 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 for proper vent sizing, low inducer voltage (115VAC), defective inducer motor, defective pressure switch, inadequate combustion air supply, disconnected or obstructed pressure tubing, low inlet gas pressure (if LGPS used), restricted vent, or excessive wind.

SourceCarrier 58DLA/DLX Furnace - Service Manual: Installation & MaintenanceFig. 55 / Service Label

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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

2 manuals in the MyPros+ library document this code for Carrier furnace.

Models covered by the manuals that document this code

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The full 31 procedure

Where this code is documented

Models covered by the manuals that document this code

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