What it means
Ignition lockout: system failed to ignite gas and prove flame in 4 attempts. Control auto-resets after 3 hours (see code 34).
⚠ Call a profurnace
How it shows: Status LED: 1 short flash(es) then 4 long flash(es) (code 14)
1Likely causes
- Oxide buildup on flame sensor
- Manual gas shut-off valve or gas valve turned off
- Low inlet gas pressure
- Defective hot surface igniter
- Inadequate flame carryover or rough ignition
- Control ground continuity problem
2Safe DIY steps
- Check that the manual gas shut-off valve is open and the gas valve control switch is ON
- Technicianclean flame sensor with fine steel wool and check flame current (0.5 microamp DC minimum, 4.0-6.0 nominal)
- Techniciancheck inlet gas pressure, igniter and ground (green/yellow wire must be connected to furnace sheet metal)
⚠ Safety firstIf you smell gas, do not touch any electrical switch or use a phone in the building; leave immediately and call your gas supplier from outside. Turn off electrical power at the furnace switch or breaker before opening any panel, and never bypass or jumper a limit, rollout or pressure switch. Gas valve, burner, venting, wiring and control-board work should be done by a licensed HVAC technician.
3When to call a pro
Call a licensed HVAC technician: if gas is on and the furnace still fails to light.
Find a local HVAC pro →Other Carrier codes
13
Limit circuit lockout: a limit or flame rollout switch was open longer than 3 minutes. Control auto-resets after 3 hours (see code 33).
21
Gas heating lockout. Control will NOT auto-reset.
22
Abnormal flame-proving signal: flame is proved while the gas valve is de-energized. Inducer runs until the fault is cleared.
23
Pressure switch did not open.
31
Low (LPS) or high (HPS) pressure switch did not close or reopened.
24
Secondary voltage (24 V) fuse is open.