Code index · 11 entries
Carrier furnace error codes
11 codes from the Carrier furnace manual. Select a code for causes, safe checks and when to call a pro. View the source manual (PDF).
Limit circuit lockout: a limit or flame rollout switch was open longer than 3 minutes. Control auto-resets after 3 hours (see code 33).
Ignition lockout: system failed to ignite gas and prove flame in 4 attempts. Control auto-resets after 3 hours (see code 34).
Gas heating lockout. Control will NOT auto-reset.
Abnormal flame-proving signal: flame is proved while the gas valve is de-energized. Inducer runs until the fault is cleared.
Pressure switch did not open.
Low (LPS) or high (HPS) pressure switch did not close or reopened.
Secondary voltage (24 V) fuse is open.
Limit circuit fault: a limit or flame rollout switch is open. Becomes lockout 13 if open longer than 3 minutes.
Ignition proving failure: flame not sensed during trial for ignition. Control tries 3 more times before lockout 14.
Control circuitry lockout. Auto-resets after 1 hour.
Line voltage (115 VAC) polarity reversed. If twinned, check 24 V transformer phasing.