Furnace Flame Sensor Replacement Cost (U.S., 2026)
Estimated $75–$250 for a flame sensor replacement in the U.S., depending on the HVAC system and the exact fault. Built from 4 sourced repair jobs across 1 HVAC type — each row keeps its own sources. Reviewed July 2026.
What a flame sensor replacement costs, by HVAC and fault Estimated
Each row is a real sourced repair job whose description matched this part. Parts and total are that job's own national range — follow the problem link to localize it to your area.
| HVAC | Problem | Repair | Parts | Total | DIY |
|---|---|---|---|---|---|
| Gas Furnace | Not heating / blowing cold air | Flame sensor cleaning or replacement | $10–$30 | $75–$250 | DIY possible |
| Gas Furnace | Short cycling (turns on and off) | Flame sensor cleaning | $0–$20 | $75–$200 | DIY possible |
| Gas Furnace | Flame sensor cleaning / replacement | Flame sensor cleaning (no replacement) | $0–$10 | $75–$200 | DIY possible |
| Gas Furnace | Flame sensor cleaning / replacement | Flame sensor replacement | $10–$30 | $90–$250 | DIY possible |
Base: 2 published national repair-cost guides (full source registry on the methodology page), published rates from 4 local repair companies · National base ranges — localize any figure on its linked problem page · Reviewed July 2026 · Estimated
Related HVAC cost guides
The full cost guide for each HVAC system a flame sensor replacement shows up in:
Estimated national ranges aggregated from the linked problem pages — no per-page localization is applied here. See the methodology for the localization method and named 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).