Carrier Furnace Error Codes

14 error codes for Carrier furnace models. Each links to the full diagnostic procedure from the service manual.

CodeDescription
11No previous code stored; stored status codes are erased when power (115VAC or…12Blower runs for 90 seconds after power up if unit is powered up during a call…13Limit circuit lockout occurs if the limit, draft safeguard, flame rollout, or…14Ignition lockout; system failed to ignite gas and prove flame in 4 attempts…21Gas heating lockout; control will NOT auto-reset.22Abnormal flame-proving signal; flame is proved while gas valve is de-energized23Pressure switch did not open.24Secondary voltage (24VAC) fuse is open.31Pressure switch did not close or reopened; if open longer than 5 minutes…32Low-heat pressure, draft safeguard (when used), or auxiliary limit switch…33Limit circuit fault; indicates a limit, draft safeguard, flame rollout, or…34Ignition proving failure; if flame is not sensed during the trial for ignition…43Low-heat pressure, draft safeguard (when used), or auxiliary limit switch (when…45Control circuitry lockout; auto-reset after one hour due to gas valve relay…
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