Carrier Furnace 45 Error Code — Meaning & Repair Cost (2026)
Lockout due to recurrent flame loss. Below: the most likely causes, and what the matching repair costs — Estimated national ranges with a metro localizer. Reviewed July 2026.
What 45 means
Lockout due to recurrent flame loss.
Likely causes, most common first
- Dirty flame sensor
- Low gas pressure
Base: 1 published national repair-cost guide (retrieved 2026-07) · full source registry on the methodology page · Code meaning & causes · Reviewed July 2026
What it usually costs to fix Estimated
45 on a Carrier furnace resolves to the gas furnace flame sensor cleaning / replacement problem. Carrier parts typically run ×1.15 against the mainstream baseline (Same engineering platform as sister brands Bryant/Payne (same compressors, control boards, blower motors, contactors, run capacitors per a parts-focused comparison), but sold through Carrier's more selective Factory Authorized Dealer network; a brand cost-comparison piece puts Carrier at roughly 10-20% more for the same underlying hardware than sister brand Bryant.), and the ranges below already include it.
$75–$255 national estimate to fix the fault behind 45 (Carrier parts ×1.15). Enter a ZIP to localize.
| Most common repair | Typical total | DIY? |
|---|---|---|
| Flame sensor cleaning (no replacement) | $75–$200 | DIY possible |
| Flame sensor replacement | $90–$255 | DIY possible |
Plus a typical service-call / diagnostic fee of $75–$150, often credited toward the repair.
Pick a quality tier for a class-typical estimate, or a specific brand to override it (brand adjusts the parts portion only). Enter a ZIP or Canadian postal code to localize to your metro's labor costs. Everything updates without a page reload; no data leaves your browser except the shard lookup.
Base: 2 published national repair-cost guides (retrieved 2026-07) · full source registry on the methodology page · National base range (BLS OEWS May 2025 + BEA RPP 2024) · Reviewed July 2026 · Estimated
Codes are universal — your location changes the repair price, never the code's meaning. See the methodology for the exact localization formula and sources.
Reviewed by a Red Seal–certified appliance technician who also holds a Technical Safety BC gas ticket (Gas-C) and an ODS/halocarbon refrigerant ticket (CFC/HCFC/HFC).