Carrier status code 14: ignition lockout after four failed trials
Carrier status code 14 is ignition lockout. The control counts four unsuccessful trials, stops, and resets itself after three hours. Here is what that means.
What this means
Status code 14 on this Carrier control is ignition lockout. The guide states that lockout occurs after four consecutive unsuccessful trials for ignition and that the control resets itself automatically after three hours. The number 14 therefore counts failures; it does not identify which part of the ignition sequence failed.
Equipment and model context
Carrier deluxe two-stage gas-fired induced-combustion furnaces with PSC or ICM blower motors, covered by troubleshooting guide 58-3T
- Deluxe two-stage induced-combustion furnaces, PSC blower
- Deluxe two-stage induced-combustion furnaces, ICM blower
The count of four trials and the three-hour automatic reset are stated in Carrier troubleshooting guide 58-3T for deluxe two-stage induced-combustion furnaces. Single-stage and modulating Carrier controls, and the same number on other manufacturers, follow their own literature and their own retry counts.
What you may notice
- The furnace goes through several audible start attempts, each ending without sustained heat, and then falls silent.
- Heat returns on its own hours later, runs for a while, and the whole pattern repeats.
- The diagnostic LED shows one flash followed by four flashes when viewed through the sight glass.
Likely causes
- Gas supply that is interrupted, restricted, or at the wrong pressure prevents a burner from lighting however healthy the ignition components are.
- A hot-surface igniter that has aged can still glow while failing to reach the surface temperature the burner needs.
- A flame sensing electrode coated with oxide can fail to confirm a flame that did in fact light, which the control counts as a failed trial.
Diagnostic paths
The burner lights and then goes out after a few seconds
You hear ignition succeed, the burner runs briefly, and then it shuts down, with the sequence repeating a few times before silence.
Note that the flame established before it was lost. Lighting followed by loss points the investigation toward flame proving rather than toward the igniter.
Nothing lights at all across every attempt
The inducer runs and the sequence proceeds, but no burner flame is heard or seen at any point during the attempts.
Check that any manual gas valve serving the furnace is in its normal position and that other gas appliances in the property still work, then leave the furnace off.
It only fails in severe cold or high wind
The furnace lights reliably in mild conditions and locks out during storms, high winds, or the coldest nights of the season.
Record the weather each time it happens. Venting and combustion air behaviour under wind is a distinct line of investigation from a worn ignition component.
Counting is the mechanism here. Each unsuccessful trial increments a counter, the fourth one locks the control out, and a three-hour timer releases it so the furnace can try again without anybody attending.
- Trial oneFirst unsuccessful attempt recorded
- Trials two and threeRetries under the same conditions
- Trial fourLockout declared by the control
- Three hoursAutomatic reset allows a new attempt
| Stage | What has to happen | What failure looks like |
|---|---|---|
| Purge | The inducer proves the vent path | Sequence never reaches ignition |
| Igniter warm-up | The surface reaches ignition temperature | Gas valve opens with no light |
| Flame establishment | Gas ignites at the burner | Brief flame or none |
| Flame proving | The sensor confirms the flame | Flame lights then shuts off |
Why the furnace seems to fix itself overnight
The three-hour automatic reset produces one of the more confusing patterns a homeowner meets. The furnace fails in the evening, the house cools, and by morning it is running again, which feels like the problem resolved itself. It did not. The timer expired, the control offered four more trials, and whether they succeed depends on conditions that may have shifted slightly rather than on any repair.
This is why a furnace that works intermittently over several days is reporting a real and progressive fault rather than a glitch. The more valuable record is not the code but the schedule: when it stopped, when it started, and what the weather was doing. That turns an intermittent complaint into something a technician can test against.
The count says nothing about the cause
A trial for ignition is a chain of events, and the control only knows whether the chain finished. Gas has to arrive at the right pressure, the igniter has to reach temperature, the burner has to light, and the flame sensor has to confirm it within the allowed window. A failure anywhere in that chain increments the same counter, and four of them produce the same code 14.
What separates them is observation. Whether a flame was ever heard or seen, whether it held briefly before dying, and whether other gas appliances behave normally all narrow the chain from outside the cabinet. The flame sensing explainer covers how a furnace proves a flame it cannot see, and the furnace blowing cold air reference describes the pattern this control produces when trials keep failing.
What to give the technician
Tell the technician the furnace model and serial number, code 14 as displayed, whether any flame was seen or heard, how the failures track with weather and time of day, and whether other gas appliances are affected.
Safe homeowner checks
- Confirm that other gas appliances in the property are working normally, which separates a supply-wide interruption from a furnace-specific fault.
- Check that the thermostat is calling for heat and that its batteries, if fitted, are good, so a failed call is not mistaken for a failed ignition.
- Note the time of each lockout and the weather conditions, then leave the furnace off rather than forcing repeated retries.
Is a reset appropriate?
Carrier's control releases this lockout automatically after three hours. Cutting power to force an earlier retry only spends four more trials against the same condition and erases the diagnostic record.
When to call a technician
- Measuring gas pressure, testing igniter resistance, cleaning or replacing a flame sensor, and inspecting venting are licensed gas-furnace tasks.
- A smell of gas at any point is an emergency. Leave the property, avoid switches and flames, and contact the emergency number for your gas supplier before anything else.
Questions people ask about this
Why does the furnace try four times?
Repeating the trial covers a transient condition such as a brief gas supply disturbance. Four attempts is the limit this control allows before it decides the condition is persistent and stops.
Will code 14 clear on its own?
The guide states the control resets automatically after three hours. The code clearing is the timer expiring rather than any evidence that the ignition problem has been resolved.
Is a failed igniter the only cause?
No. Gas supply, igniter condition, burner lighting, and flame proving each form part of the trial, and a failure in any of them increments the same counter toward the same lockout.
Evidence recordHow this page was checked
service manual · checked 2026-09-15
Every technical claim above was written from primary documentation held in the HVAC Bench evidence record: Carrier technical literature. Where a source limits a definition to certain models, test conditions, or product classes, that limit is repeated here rather than generalised.
- Documentation class
- service manual
- Scope of the definition
- Carrier deluxe two-stage gas-fired induced-combustion furnaces with PSC or ICM blower motors, covered by troubleshooting guide 58-3T
- Last checked
- 2026-09-15