Carrier Furnace LED On Solid
StatusShown as: Status LED glows steady, no flashing
Normal. The control has 24 VAC power and no fault is stored or active.
Manual wording: “CONTINUOUS ON - Control has 24VAC power.”
Documented for: 58MCB, 58MVP, 58UVB and most Carrier 58-series furnaces
Likely causes, most common first
- Normal standby or normal operation
What you can safely check yourself
- Nothing to do - a steady light means the board is powered and healthy
When to call a technician
If the furnace is not heating even though the light is steady, the problem is more likely the thermostat or its wiring than the furnace control.
A Carrier furnace throwing this code repeatedly has a reason — clearing the code without fixing the cause just hides it.
Sources
- 58MCB 4-Way Multipoise Fixed-Capacity Condensing Gas Furnace - Service Manual (Carrier, 58MCB single-stage condensing gas furnace) · checked 2026-08-25
- Troubleshooting Guide - Variable Speed, Two-Stage Gas Furnaces (Form 58-06T) (Carrier, 58MVP, 58UVB and other Carrier variable-speed two-stage gas furnaces (replaces 58MVP-10SM)) · checked 2026-08-25