York TM9E furnace 2 red flashes: Pressure Switch Closed
Professional repair
What do 2 red LED flashes mean on a York TM9E furnace? At the start of a heat cycle the pressure switch was already closed when the control expected it open. The control blocks the ignition sequence while this condition exists.
This condition involves the gas or combustion side. If you smell gas or a CO alarm sounds: leave, then call your gas utility. Diagnostic info here is reference — combustion repairs are for licensed technicians. All six emergency signs →
A technician should test the pressure switch and its wiring. The switch must not be adjusted or bypassed, and the code alone does not prove the switch has failed.
Possible causes
- Faulty pressure switch, listed among the OEM checks TECH
- Miswired pressure switch circuit, also an OEM check TECH
Parts for this code
No model-verified part number is listed here. Have the fault diagnosed and the correct part matched to your furnace before ordering.
Questions about this code
What do 2 red LED flashes mean on a York TM9E furnace?
At the start of a heat cycle the pressure switch was already closed when the control expected it open. The control blocks the ignition sequence while this condition exists.
How do I fix York TM9E furnace 2 red flashes?
Book service and report the LED color, flash count and whether the furnace attempted to start. The technician checks the switch and its wiring, corrects any miswiring, and replaces the switch only if testing confirms a fault.
How much does it cost to fix York TM9E furnace 2 red flashes?
Expect diagnostic time for the pressure switch circuit. Correcting miswiring is mainly labor, while a confirmed switch fault adds a matching replacement part and fitting.
Related symptoms
These symptoms can appear alongside this code. The link is an association, not a diagnosis, and code meanings vary by brand, model and control.
Applies to
TM9E
Different York generations use different code maps. If your series isn't listed, don't assume this meaning — check your blower-door label.
Verified against YORK TM9E Series Installation Manual — Single Stage ECM Residential Gas Furnaces, p.33
Last verified 2026-10-07 · page updated 2026-10-07 · how we verify
Related York furnace codes
These codes use the same york tm9e single-stage ecm tri-color led control system.