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ErrBase

Carrier Furnace Code 14: Ignition Lockout After Multiple Failures

Quick Answer

Carrier furnace Code 14 (1 short, 4 long LED blinks) is an ignition lockout. The furnace attempted ignition multiple times, failed each time (same root cause as Code 34), and has gone into safety lockout mode. A manual reset is required to unlock the board.

Carrier furnace Code 14 (1 short, 4 long LED blinks) is an ignition lockout. The furnace attempted ignition multiple times, failed each time (same root cause as Code 34), and has gone into safety lockout mode. A manual reset is required to unlock the board. The most important thing is not just resetting, but diagnosing why Code 34 kept occurring: dirty flame sensor, failed ignitor, or low gas pressure. Clean the flame sensor before resetting to avoid re-entering lockout.

CarrierFurnaceSeverity: highDifficulty: intermediate78% DIY Success
Time to Fix
20–75 min
Difficulty
intermediate
Parts Cost
$10 – $50
Tools Needed
Multimeter with microamp DC setting, 0000 steel wool
Wrong code?

Not seeing 14 on your display?

Select what your appliance is actually doing and we'll take you to the right guide.

all carrier furnace LED codes
HUB
flame not detected after ignition
34
gas valve not opening
31
fault code reset procedure
RESET

What Does the 14 Code Mean?

Extended ignition lockout after repeated Code 34 failures. Manual reset required. Root cause is same as Code 34: dirty flame sensor, failed ignitor, or gas issue.

Most Likely Causes

Based on aggregated repair data, here is the probability breakdown for this error code:

Fouled flame sensor rod that triggered repeated Code 3440%
Failed hot surface ignitor causing repeated ignition failure24%
Low gas pressure preventing reliable flame establishment14%
Control board timing sequence fault12%
Gas valve not opening fully or at correct timing10%

Symptoms You May Notice

  • Furnace completely non-responsive to thermostat heat calls
  • Control board LED shows 1 short + 4 long blinks in a repeating pattern
  • Furnace was previously cycling with Code 34 before going fully silent
  • No inducer motor, ignitor, or any startup activity
  • Code clears briefly on reset then returns within one heating attempt

Can you reset a Carrier furnace to clear the 14 code?

To reset a Carrier furnace from Code 14 lockout: turn the thermostat to OFF, wait 30 seconds, then set back to HEAT. If the thermostat reset does not clear the lockout, turn the circuit breaker off for 30 seconds and back on. Always address the underlying ignition failure (dirty flame sensor or failed ignitor) before resetting to avoid re-entering lockout on the first attempt.

Tools Required for Diagnosis

Multimeter with microamp DC setting0000 steel woolFlathead and Phillips screwdriversWork gloves

Diagnostic Checklist

Follow these steps in order. We start with the easiest external fixes before opening up the machine.

1

Before resetting

Before resetting, open the lower cabinet and locate the flame sensor rod (single wire, thin metal rod extending into the burner flame path). Remove it and clean the rod with 0000 steel wool until the surface is shiny. This addresses the most common root cause of Code 14 (accumulated Code 34 cycles from a fouled sensor) before the reset.

2

With the root cause addressed, reset the furnace lockout

3

With power off

4

Verify gas supply by confirming the manual shutoff valve behind

5

If the furnace still re-enters lockout after flame sensor cleaning

Replacement Parts

If your diagnostic testing proves the component has failed, you will need a replacement. We recommend OEM parts over aftermarket for water-handling components.

Part Name
Flame Sensor RodLH680016 · $10–$20
Hot Surface IgnitorHH18HA483 · $25–$50

Repair vs. Replace Calculator

Appliance Age (Years)7 Yrs
Labor Approach
Our Verdict
REPAIR
Estimated Cost: $30 (Parts) vs $2750 (New Machine)

Frequently Asked Questions

What is the difference between Carrier Code 34 and Code 14?
Code 34 is a single ignition proving failure: the furnace tried once, no flame was confirmed, and it shut down. Code 14 is an extended lockout: the furnace tried to light multiple times (typically 3 attempts), received Code 34 each time, and has now locked out entirely as a safety measure. Code 14 requires a manual reset while Code 34 may attempt to restart on its own. Both have the same root causes.
How many times will a Carrier furnace attempt ignition before going to Code 14?
Most Carrier control boards allow 3 ignition attempts before triggering the Code 14 lockout. The exact number varies by board version and model. After each failed attempt (Code 34) the board waits a brief period before retrying. After the final failed attempt, it goes into indefinite lockout until manually reset.
Is it safe to reset a Carrier furnace that is in Code 14 lockout?
It is safe to reset once, but you should clean the flame sensor or inspect the ignitor before doing so. If you reset without addressing the root cause, the furnace will complete its 3-attempt sequence again and return to Code 14 lockout. Repeatedly resetting without diagnosis allows the gas valve to open multiple times without successful ignition, which poses a low but real risk of raw gas accumulation.
My Carrier furnace shows Code 14 every morning during cold weather. Why?
A furnace that enters Code 14 consistently on the first cold morning call may have a flame sensor that is borderline: clean enough to work for a few cycles but accumulating coating and losing signal strength over time. The sensor should be professionally cleaned or replaced. Alternatively, the ignitor may be cracking with thermal age and takes several attempts to light when cold.
Do I need a technician to clear Code 14 on a Carrier furnace?
No. Code 14 can be reset by a homeowner by cycling the thermostat or circuit breaker. However, the underlying ignition fault (Code 34) should be diagnosed and repaired. Cleaning the flame sensor is a homeowner-level task that requires no special tools. Replacing the ignitor or diagnosing the gas valve is more involved but still within reach for a skilled DIYer. If the furnace continues to re-enter lockout after both the sensor and ignitor are addressed, a technician should test gas pressure and control board function.

Related Carrier Furnace Error Codes

Code: HUBCarrier Furnace LED Flash Codes: Complete Fault Code GuideCode: 34Carrier Furnace Code 34: Ignition Proving FailureCode: 31Carrier Furnace Code 31: Gas Valve FailureCode: RESETHow to Reset a Carrier Furnace and Clear LED Fault Codes

Models Known to Experience 14 Errors

This repair applies to most Carrier furnaces with this error code. Common model numbers include:

59TP6, 59MN7, 59SP5, 59TP6A, 58PAV

Last verified for technical accuracy on March 14, 2026