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I replaced the SFS. Still gives an E05 error 🙁 I'll call a real repairman!

Installed in 2020. Rubber/plastic insulation

Thanks for those resources! Does the discrepancy in reported versus measured temperatures point to the stack flue sensor? As opposed to the other million things

two questions! I've scoured previous threads, but haven't seen this specific question. My heater will fire and run for 20-30 seconds SOMETIMES, and sometimes will run for several minutes at a time before failing with error E05 Through the many helpful posts in this forum, I learned to hold...