York Furnace 6 red flashes: What It Means & How to Fix It
Compiled & reviewed by the HVAC Flash Codes editorial team · Updated 2026-06-25 · confidence: high
⚠️ Try the safe checks, then a pro
What does York furnace 6 red flashes mean?
While operating, the pressure switch opened four times during the call for heat. The furnace locks out for one hour and then restarts. Most often caused by A faulty inducer (draft) motor.
What your furnace LED does. The diagnostic light blinks 6 flashes, pause, repeat — that pattern is York furnace 6 red flashes.
What York furnace 6 red flashes means
While operating, the pressure switch opened four times during the call for heat. The furnace locks out for one hour and then restarts.
Common causes
A faulty inducer (draft) motor
A blocked vent pipe / restricted flue
A faulty pressure switch
Homeowner-safe steps to try
Note the code and allow the one-hour soft lockout to reset, or cycle power off/on
Check outside that the flue/intake termination is clear of snow, ice, or debris
When to call a licensed HVAC technician
If the basic checks below don't clear the code, the fault recurs, or anything involves the gas valve, burners, flame sensor or wiring, stop and book a licensed HVAC technician. Repairs to the combustion or gas system are not DIY.
⚠️ Safety first. Gas furnaces burn fuel and produce combustion gases. If you ever smell gas (a rotten-egg or sulfur odor), hear hissing, or your carbon-monoxide alarm sounds, do not touch light switches, thermostats, or the furnace — leave the home immediately and call your gas utility's emergency line or 911 from outside. Homeowners should limit themselves to simple, safe steps: setting the thermostat, checking and replacing the air filter, confirming the furnace switch and breaker are on, keeping supply registers and return grilles open, and clearing snow, ice, or debris from outdoor vent and intake terminations. Never bypass, jumper, or reset safety switches (limit, flame-rollout, or pressure switches), never open the gas valve or burner compartment, and never attempt combustion, electrical, or control-board repairs yourself. Error codes point toward a problem but are not a substitute for proper diagnosis — when in doubt, turn the system off and call a licensed HVAC technician. Keep working carbon-monoxide detectors on every level of your home.
When to call a pro: If it recurs, call a licensed HVAC technician to inspect the inducer, venting, and pressure switch. Do not adjust or bypass the pressure switch. If you smell gas, leave and call your gas utility or 911 from outside.
York furnace 6 red flashes FAQ
What does York furnace 6 red flashes mean?
While operating, the pressure switch opened four times during the call for heat. The furnace locks out for one hour and then restarts.
What causes York furnace 6 red flashes?
Common causes: A faulty inducer (draft) motor; A blocked vent pipe / restricted flue; A faulty pressure switch.
Can I fix York furnace 6 red flashes myself?
You can safely try: Note the code and allow the one-hour soft lockout to reset, or cycle power off/on; Check outside that the flue/intake termination is clear of snow, ice, or debris. If it recurs, call a licensed HVAC technician to inspect the inducer, venting, and pressure switch. Do not adjust or bypass the pressure switch. If you smell gas, leave and call your gas utility or 911 from outside.