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Carrier Furnace error codes

Search 2 diagnostic guides for Carrier Furnace faults. Each guide explains what the code means, what to check, and which part may be involved.

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Code 31 signals that the furnace draft inducer motor ran, but the pressure switch failed to sense proper negative draft pressure.

Code 33 indicates the high-limit switch or rollout switch has tripped due to excessive heat build-up inside the furnace main heat exchanger.