York Furnace 2 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 2 red flashes mean?
The pressure switch is closed when it should be open. The control verifies the contacts are open at the start of each cycle and won't allow ignition if they're stuck closed. Most often caused by A faulty (stuck-closed) pressure switch.
What your furnace LED does. The diagnostic light blinks 2 flashes, pause, repeat — that pattern is York furnace 2 red flashes.
What York furnace 2 red flashes means
The pressure switch is closed when it should be open. The control verifies the contacts are open at the start of each cycle and won't allow ignition if they're stuck closed.
Common causes
A faulty (stuck-closed) pressure switch
Miswiring at the pressure switch
Homeowner-safe steps to try
Note the code; cycle furnace power off and on to see if it clears
Check that the furnace door panel is fully closed (the door switch must engage)
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: Call a licensed HVAC technician to test and replace the pressure switch — never adjust or bypass a pressure switch. If you smell gas, leave and call your gas utility or 911 from outside.
York furnace 2 red flashes FAQ
What does York furnace 2 red flashes mean?
The pressure switch is closed when it should be open. The control verifies the contacts are open at the start of each cycle and won't allow ignition if they're stuck closed.
What causes York furnace 2 red flashes?
Common causes: A faulty (stuck-closed) pressure switch; Miswiring at the pressure switch.
Can I fix York furnace 2 red flashes myself?
You can safely try: Note the code; cycle furnace power off and on to see if it clears; Check that the furnace door panel is fully closed (the door switch must engage). Call a licensed HVAC technician to test and replace the pressure switch — never adjust or bypass a pressure switch. If you smell gas, leave and call your gas utility or 911 from outside.