Baxi [E.04.10] fault codewhat it means and how to fix it

E.04.10 is the ignition lockout on the two newest Baxi display systems, and the two manuals define it slightly differently. The 2016 Baxi 200 and 400 Combi manual, where it is shown as E04 alternating with 10, calls it "5 burner start-up failures"; the 600 Combi 2 manual of 2023, where it is printed with dots, says "Burner failed to ignite after 4 attempts", and Baxi's professional page uses the Combi 2 wording. Either way the board has sparked, seen no flame, and stopped with a permanent fault — the letter E — that "prevents the boiler operating and will not automatically reset".

The reset differs by generation and both are quoted here because the hold times are not the same: on the 200 and 400 Combi "the RESET button must be pressed for at least 3 seconds to restart the boiler", and the same manual warns that "pressing the RESET button for 5 seconds will start the de-aeration process", a five-minute purge you did not ask for; on the Combi 2 "press the RESET button for one second".

Baxi's quick-start guide for the Combi 2 puts E.04.10 in a box headed "Error codes that you can put right yourself" with the explanation "Frozen condensate pipe — sometimes when it's very cold, the white plastic condensate pipe outside freezes, and your boiler will shut down to protect itself", and points to their thawing video. That is the householder's share of this code. The installer's share, from the Combi 2 table, is longer: gas supply pressure, gas valve connection and calibration, electrode connections and condition, fan operation and "the condition of the flue gas exhaust (blockages)"; the 200/400 table adds "check the earthing" and, for a spark with no flame, "purge the gas supply to remove air". A related code, H.03.02 "temporary flame loss", is the same boiler losing a flame it had lit and trying again on its own, and E.01.04 is that happening five times in a day.