York TM9E furnace LED steady on: Control Failure
Professional repair
What does a steady LED in red, green or amber mean on a York TM9E furnace? An LED lit steadily in red, green or amber indicates a control failure. York states the control is not field repairable.
Before you touch anything: the six signs that mean stop troubleshooting and call a pro →
Board diagnosis and replacement are technician work. The control cannot be repaired in the field, and power-reset steps in service literature are not homeowner instructions.
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 a steady LED in red, green or amber mean on a York TM9E furnace?
An LED lit steadily in red, green or amber indicates a control failure. York states the control is not field repairable.
How do I fix York TM9E furnace LED steady on?
Note the steady color and book service. A technician confirms the control failure and, if verified, fits a replacement control that matches the furnace model, since the board is not field repairable.
How much does it cost to fix York TM9E furnace LED steady on?
Expect diagnosis plus a replacement control and fitting labor if the failure is confirmed. The part must match the furnace's model and control specification.
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
Verified against User’s Information Manual — All Residential Multi-position Gas Furnaces (33 in. models), p.5
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.