Where the money goes
Part $800–$2,000Labor $0–$2,700Typical labor time: 4–8 hrs
You might need this if…
DIY difficulty: professional-only•Rollout switch trips
•Visible cracks or rust
•Soot or unusual odors
The part
The heat exchanger separates combustion gases from indoor air. Cracks or rust can trigger rollout or CO risks.
Error codes that lead to this repair
6 FlashFlame-rollout safety lockoutEmergency13Limit or rollout circuit lockoutEmergency33Flame-rollout safety lockoutEmergency200Rollout circuit hard lockoutEmergency33Manual-reset safety circuit openEmergency13Limit or rollout circuit lockoutEmergency33Flame-rollout safety lockoutEmergency5 BlinksFlame-rollout safety lockoutEmergency33Manual-reset safety circuit openEmergency4 FlashLimit or rollout circuit openEmergency7 FlashLimit or rollout soft lockoutEmergency13Limit or rollout circuit lockoutEmergency33Flame-rollout safety lockoutEmergency4 FlashLimit or rollout circuit openEmergency7 FlashLimit or rollout soft lockoutEmergency5 BlinksFlame-rollout safety lockoutEmergency5 BlinksFlame-rollout safety lockoutEmergency6 FlashFlame-rollout safety lockoutEmergency4 FlashLimit or rollout circuit openEmergency7 FlashLimit or rollout soft lockoutEmergency4 FlashLimit or rollout circuit openEmergency7 FlashLimit or rollout soft lockoutEmergency4 FlashLimit or rollout circuit openEmergency7 FlashLimit or rollout soft lockoutEmergency6 BlinksFlame-rollout safety lockoutEmergency6 BlinksFlame-rollout safety lockoutEmergency
This is general information, not professional advice. Gas, electrical, and combustion repairs can be dangerous — when in doubt, call a licensed technician.