Vitodens 100 F1 Error: Flue Gas Temperature High After Service Checks—What Next?

The discussion addresses the Vitodens 100 F1 error indicating excessively high flue gas temperature despite comprehensive service checks including burner inspection, exchanger cleaning and descaling, pump replacement, chimney draught measurement, and CO2 level verification. Flue gas temperature readings reached 130-140°C, ruling out sensor faults. Venting the boiler and pump was performed without improvement. The exchanger was suspected to have deformities caused by freezing, potentially increasing coil gaps and reducing heat transfer efficiency, leading to high exhaust temperatures and uneven heating. Suggestions included flushing the entire heating system under pressure to remove scale and rust deposits, checking gas nozzles for correct sizing and gas pressure, and verifying the absence of chimney obstructions such as birds. The possibility of replacing the heat exchanger was considered costly, prompting consideration of purchasing a new boiler for warranty and spare parts. A related note mentioned a similar F1 error on a Vitodens 200 WB2B resolved by thorough exchanger and pump servicing and proper venting.
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