York 7 Flashes Error Code
Open rollout — 24 VAC was lost at the control's flame rollout switch input.
Source: York 3/York_INSTALLATION-MANUAL-ZX-A7-08-TO-14-SER_InstallationGuide_HVAC_EN-5513316-uim-c-0819.pdf
What does York 7 Flashes mean?
Seven flashes means the flame rollout switch opened: 24 VAC was lost at the control's rollout switch input (P1-6). The gas valve relay opens after a five-second inducer post-purge so gas operation stops, then the inducer relay also opens. A rollout trip indicates flame or hot combustion gases spilled out of the burner area, which is a serious combustion fault. The code clears only when the rollout switch is reset and the underlying condition is corrected.
Symptoms
- Furnace stops heating and will not relight
- ICB flashes a counted burst of 7 on the LED
- Possible signs of soot, scorching, or heat near the burner box
- Rollout switch button is tripped and requires manual reset on some designs
Common causes
- Blocked combustion air openings or insufficient clearance
- Dirty or blocked burners interfering with gas flow
- Improper gas inlet or manifold pressure
- Wind, rain, or snow entering the heat compartment
- Air leaks or a heat-exchanger breach disturbing combustion
Ask the AskWhiz AI about York 7 Flashes
AskWhiz
online
Diagnostic steps
Clear combustion air openings
Verify the combustion air openings are unblocked and the unit has proper clearance to the structure and adjacent units.
Inspect and clean the burners
Confirm the burners are clean and free of blockages that could interfere with gas flow.
Verify gas pressures
Confirm proper gas inlet pressure and that the gas valve is adjusted to provide proper manifold pressure.
Protect against weather and leaks
Verify no wind, rain, or snow is entering the compartment and there are no conditioned-air leaks or heat-exchanger breaches affecting the burners.
Check rollout wiring
Verify the wiring for the rollout switch is intact before resetting the switch.
When to call a professional
A rollout trip is a life-safety condition: flame or combustion gases escaped the burner enclosure. Do not simply reset the switch and walk away. Call a licensed HVAC technician to find the root cause — a blocked vent, overfiring, or a cracked heat exchanger can all cause rollout. A professional must perform a combustion analysis and confirm the heat exchanger is sound before returning the furnace to service.
Stop searching through PDFs. Our AI assistant on WhatsApp is trained on official York documentation and can diagnose this fault code and guide you through the repair in minutes.
5 free questions per bot in your browser — no signup.
Other York Error Codes
Normal operation — the ignition control board is powered and ready to respond to a heating demand.
LED is steady off — no power to the control, or the control has suffered catastrophic damage.
LED is steady on — the control's microprocessor has not passed its self-check.
Induced draft pressure switch did not close — the switch failed to prove airflow within 10 seconds of the inducer starting.
Induced draft pressure switch stuck closed — the switch reads closed at the same moment a call for heat begins.
Flame could not be established — no flame was sensed in three consecutive ignition attempts (lockout).
Flame loss — an established flame dropped out five times during one heating cycle (lockout).
Open limit — 24 VAC was lost at the limit-switch input for six minutes or less during a call for heat.
Gas valve failed to shut off — flame was sensed for more than 2 seconds after the gas valve output was turned off.
Indoor airflow failure / open limit — limit input lost 24 VAC for more than six minutes during a call for heat (hard lockout).
Gas valve miswire or gas valve relay fault — unexpected or missing 24 VAC at the gas valve outputs.