York Furnace Igniter Not Working — What’s Happening
When a York furnace igniter is not working, the control board is typically calling for heat and energizing the igniter, but the furnace fails to prove flame within the trial period. After repeated attempts, the board enters ignition lockout. This is not usually a standalone error code but part of an ignition failure sequence, often displayed as 7 red LED flashes on many York models, indicating ignition lockout after failed retries.
The furnace may be trying to light but never catches, or the igniter may not be glowing at all. Even if the igniter glows, the system can still lock out if the flame sensor does not detect flame or if gas flow is interrupted. Common underlying issues include a failed or cracked igniter, a dirty or misaligned flame sensor, gas supply problems, or airflow and venting restrictions that prevent the ignition sequence from completing.
Most Likely Causes
- Failed or cracked hot surface igniter The igniter element cracks or burns out over time and either will not glow or cannot ignite the gas even when powered.
- Dirty or misaligned flame sensor The flame sensor becomes coated with carbon or soot, preventing it from proving flame after ignition and causing the board to shut down and retry until lockout.
- No gas supply or gas valve failure Gas is off at the appliance shutoff, the main valve is closed, or the gas valve itself fails to open during the trial for ignition.
- No voltage to the igniter from the control board Wiring, connectors, or the control board output fail, so the igniter never receives the 120 V needed to heat up and glow.
- Blocked air filter or restricted airflow A dirty filter or blocked return prevents the inducer and pressure switches from completing the safety circuit, stopping ignition before the igniter is energized.
- Blocked exhaust vent or inducer problem Vent blockage, condensate trap clogs, or a failed inducer motor prevent the pressure switch from closing and allowing the ignition sequence to proceed.
- Control board fault or poor grounding The board intermittently powers the igniter, misreads the flame signal, or has a grounding issue that causes erratic ignition behavior and lockout.
How to Diagnose and Fix
- Check the LED fault code on the York control board and count the flashes to confirm whether the furnace is in ignition lockout or another fault condition.
- Verify the thermostat is calling for heat and the furnace is receiving the call to start, then check that the air filter is clean and return airflow is not blocked.
- Inspect the hot surface igniter through the sight glass or access panel for visible cracks, chips, or breaks, and replace it if damaged.
- Measure voltage at the igniter terminals during the trial for ignition using a multimeter set to AC volts, looking for 120 V when the board calls for heat.
- If the igniter glows but the burners do not light or the flame drops immediately, remove and clean the flame sensor rod with fine sandpaper or a soft cloth to remove carbon buildup.
- Check that gas is on at the appliance shutoff valve and the main gas line, and listen or look for the gas valve to click open during the ignition attempt.
- Inspect the exhaust vent termination and condensate drain for blockages, and confirm the inducer motor is running and the pressure switch is closing before ignition.
- After repairs, clear the lockout by turning off power to the furnace for one minute, restore power, and observe at least two full heat cycles to confirm normal ignition and flame proving.
Parts You Might Need
| Part | Notes |
|---|---|
| York hot surface igniter | Amazon | Typically 40–90 ohms cold resistance, 120 V line-voltage device, model-specific shape and mounting. |
| Flame sensor rod | Amazon | Often can be cleaned, but replace if bent, corroded, or insulator is cracked. |
| Igniter wiring harness or connector | Amazon | Replace if terminals are burned, corroded, or making intermittent contact. |
Related Error Codes
If your appliance also shows a code on the display, these match this problem:
When to Call a Pro
Gas furnace ignition and burner work should be handled by a licensed HVAC technician. If you are not trained in gas appliance repair, do not attempt to replace the igniter, adjust the gas valve, or troubleshoot flame-proving circuits. A technician has the tools to safely measure igniter voltage, verify gas pressure, test flame sensor microamp current, and clear lockout codes according to manufacturer procedures. Any work involving gas supply, burner operation, or control board diagnostics is best left to a professional to prevent unsafe conditions and make sure code compliance. For gas line, burner, or igniter work, or if you ever smell gas, stop and call a licensed technician.