Carrier Furnace Code 11
StatusShown as: 1 short flash, 1 long flash
No previous code. The control has no fault stored - either nothing has failed or the stored code has aged out. Stored codes erase automatically after 72 hours.
Manual wording: “11 NO PREVIOUS CODE - Stored status codes are erased automatically after 72 hours or as specified above.”
Documented for: 58SC0A, 58MCB, 58MVP, 58UVB and most Carrier 58-series furnaces
Likely causes, most common first
- Normal - no fault in memory
- A previous fault was cleared by a power interruption or by the 72-hour timeout
What you can safely check yourself
- Nothing to fix - run the furnace through a full heating cycle and see whether a real code appears
When to call a technician
If the furnace is misbehaving but only shows 11, have a technician watch a live heating cycle to catch the fault as it happens.
A Carrier furnace throwing this code repeatedly has a reason — clearing the code without fixing the cause just hides it.
Sources
- 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
- Installation, Start-Up, Operating and Service and Maintenance Instructions - 58SC0A/58SC1A (Carrier, 58SC0A/58SC1A single-stage 4-way multipoise condensing gas furnace) · checked 2026-08-25
- 58MCB 4-Way Multipoise Fixed-Capacity Condensing Gas Furnace - Service Manual (Carrier, 58MCB single-stage condensing gas furnace) · checked 2026-08-25