York TM9E furnace 10 red flashes: Gas Valve On Without Call
Safety issue — act now
What do 10 red LED flashes mean on a York TM9E furnace? The control detects the gas valve energized when there is no call for heat. The inducer and main blower run, and no ignition sequence starts while it persists.
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 →
Gas-valve and wiring diagnosis is technician work. Homeowners should not attempt valve repairs or restart experiments to see whether the code clears.
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 10 red LED flashes mean on a York TM9E furnace?
The control detects the gas valve energized when there is no call for heat. The inducer and main blower run, and no ignition sequence starts while it persists.
How do I fix York TM9E furnace 10 red flashes?
With a gas odor or CO alarm, leave the home without flipping any electrical switches and call the gas utility or 911 from outside. If neither is present, keep the furnace off, run no restart experiments, and call a qualified technician.
How much does it cost to fix York TM9E furnace 10 red flashes?
Expect diagnosis of the gas valve and its control wiring. Whether the fix is a wiring correction or a valve replacement determines the parts and labor.
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.34
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.