York TM9E furnace LED off: No LED Indication
Professional repair
What does it mean when the LED is off on a York TM9E furnace? No LED is displayed. York lists lost control power, a blown fuse or a control failure as possible reasons, so a dark LED alone does not identify a failed board.
Before you touch anything: the six signs that mean stop troubleshooting and call a pro →
Safe checks before calling
Check that the thermostat display is on, the furnace's external service switch is on, and the blower door is fully in place. If a breaker has tripped, leave it and call a technician.
If external power and the blower door look correct, a technician should measure control power and check the fuse and board. Live-board testing and fuse replacement are not homeowner work.
Possible causes
- Lost control power, such as an interrupted external supply DIY-CHECKABLE
- Blown control fuse or a failed control board 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 it mean when the LED is off on a York TM9E furnace?
No LED is displayed. York lists lost control power, a blown fuse or a control failure as possible reasons, so a dark LED alone does not identify a failed board.
How do I fix York TM9E furnace LED off?
Tell the technician what you found at the thermostat, switch, breaker and blower door. They confirm whether power reaches the control and whether a fuse has blown before concluding the board needs replacing.
How much does it cost to fix York TM9E furnace LED off?
If power was only interrupted, there may be nothing to repair. Otherwise cost depends on diagnosis and whether a fuse, wiring repair or replacement control is needed.
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.