Carrier Furnace Code 46.1
StatusShown as: Major code 46 on the LED (4 short, 6 long); 46.1 on the 3-digit display
Momentary loss of power. Heating stops and restarts on its own once the power fluctuation is resolved.
Manual wording: “46.1 MOMENTARY LOSS of power - Heating operation will stop and will restart once the power fluctuation is resolved.”
Documented for: 58SC0B/58SC1B
Likely causes, most common first
- Brownout or brief power interruption to the furnace
What you can safely check yourself
- Nothing to fix if you had a power blip
- If it happens often, check that the breaker is fully seated and the furnace service switch is not loose
When to call a technician
Frequent 46.1 codes with no utility outages point to a loose 115 V connection or failing door switch - have a technician check it.
A Carrier furnace throwing this code repeatedly has a reason — clearing the code without fixing the cause just hides it.
Source
- Installation, Start-Up, Operating and Service and Maintenance Instructions - 58SC0B/58SC1B (Carrier, 58SC0B/58SC1B single-stage condensing gas furnace with 3-digit status display) · checked 2026-08-25