York furnace 2 red flashes: Pressure switch stuck closed, or an inducer error
Two red flashes means the pressure switch was closed when it should have been open, or the control has found an inducer problem. The switch must sit open at rest.
Applies to: York, Luxaire and Coleman gas furnaces using the UTEC or W/R integrated furnace control boards documented in technical service letter ST-045-09. Stored in the error code array.
What it means
The pressure switch proves the inducer is moving air before gas is released, and at rest it must be open. The control verifies that before every cycle, because a switch stuck closed would prove a draft that does not exist — allowing the furnace to fire into a flue that could be blocked. York's later boards pair this with an inducer error at the same flash count, which is a sensible grouping: both mean the draft-proving chain cannot be trusted, though they sit at different points in it.
Most common causes
- Pressure switch contacts stuck or welded closed.
- The sensing hose pinched or kinked so that it traps pressure.
- Water in the sensing hose or the pressure tap holding the switch closed.
- A short in the pressure switch wiring, electrically indistinguishable from closed contacts.
- An inducer fault the control has detected separately.
- The wrong pressure switch fitted at a previous repair.
- The low and high stage switches swapped during service.
How to diagnose it
- Note whether the inducer starts at all, since the control usually stops before that step on this fault.
- Note whether the furnace was serviced recently, since a hose or switch disturbed during other work is a common trigger.
- Check the condensate drain for backing up, since water reaching the sensing hose is a frequent cause.
- Have the stored fault history replayed, since this code is retained in the error array.
How to fix it
- Clearing a blocked condensate drain is reasonable homeowner work and addresses one of the causes.
- The pressure switch, its hoses, its wiring, and the inducer are technician work.
- Never jumper a pressure switch to get heat. It is the only thing between a blocked flue and a firing burner.
- Replace a failed switch with the exact part for the model, since setpoints are model-specific.
Notes
This code and the three-flash code are opposite halves of the same test. Counting accurately matters more here than almost anywhere else in the set, because the two point at opposite conditions and different repairs.
Related
- 3 red flashes — Pressure switch open, or first stage pressure switch open
- 6 red flashes — Pressure switch cycle lockout
All codes for this manufacturer
York, Luxaire and Coleman furnace flash codes — every code, with what differs between models.
Not sure this is your brand?
The same count means something else on other furnaces. What 2 flashes means on every brand puts them side by side.
What the fix costs
Pressure switch work runs $150–400 installed per the furnace repair cost guide, which carries a standing caution to check the venting before paying for a switch. But this code's second reading changes the budget: if the control has flagged an inducer error, inducer motor replacement runs $300–900, with brand parts availability driving most of that spread — more codes in that family are at the inducer motor code index. The cheap outcomes are real too. Water from a backed-up condensate drain holding the switch closed costs nothing beyond the clean-out if you find it yourself, and a diagnostic visit at $75–150, usually credited against the repair, settles which half of the code you are actually in.
Fix it yourself or call a professional?
The homeowner lane on this code is narrow but real: check whether the condensate drain is backing up and clear it, and check your own service history — a hose disturbed or switches swapped during recent work is a finding only you can supply, and it is one of the documented causes. The line is the switch itself. A pressure switch stuck closed is a defeated safety interlock: its whole job is to sit open until draft is proven, and the temptation to unplug hoses or jumper terminals to coax out a heating cycle is exactly the move that lets a furnace fire into a flue that might be blocked. The switch, its hoses, its wiring, and the inducer are technician work — a furnace showing this code has already told you its draft-proving chain cannot be trusted.
The same fault on other brands
Checking that the pressure switch is open before the inducer starts is a standard interlock test, and most control families give its failure a code: Carrier's status 23 (switch did not open), Allied's 11 flashes on Armstrong, AirEase, Concord and Ducane furnaces, and the Goodman GMEC96's 2 red flashes, which matches this code nearly word for word — the two tables share White-Rodgers lineage. The pressure switch code index collects 47 such codes across twelve control families, split between stuck-open and stuck-closed the same way York splits its 2 and 3 red flashes.
What this looks like
From the outside, this usually shows up as the inducer spins up but the burners never fire — that walkthrough covers what to check in order, and when it stops being a homeowner job.