Error code reference

Carrier Furnace Error Code 24

Secondary voltage (24VAC) fuse is open.

SourceCarrier 58T - Service Manual: 2-Speed Gas Furnaces (58TMA, 58TUA)Fig. 13 Service Label

Diagnostic procedure

The full 24 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 short circuit in secondary voltage (24VAC) wiring including thermostat leads; disconnect thermostat leads to isolate short circuit.

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 24 procedure

Where this code is documented

Models covered by the manuals that document this code

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