York TM9E furnace 1 red flash: Flame Without Heat Call
Safety issue — act now
What does 1 red LED flash mean on a York TM9E furnace? The control sensed flame when there was no call for heat. In response it runs the combustion-air inducer and the supply-air blower.
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 →
Diagnosing unexpected flame and the gas valve is qualified technician work. No homeowner gas-valve repair, restart attempt or other operating trial should be made.
Possible causes
- Gas valve leaking or closing slowly, listed among OEM checks 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 does 1 red LED flash mean on a York TM9E furnace?
The control sensed flame when there was no call for heat. In response it runs the combustion-air inducer and the supply-air blower.
How do I fix York TM9E furnace 1 red flash?
If there is a gas smell or a CO alarm, get everyone outside without using electrical switches and call the gas utility or 911 from there. If not, keep the furnace off, run no further tests, and call a qualified technician.
How much does it cost to fix York TM9E furnace 1 red flash?
Expect gas-valve and wiring diagnosis. If the valve is leaking or closing slowly, replacement adds parts and labor; the final cost rests on that finding.
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.