Baxi E133: failed ignition and the frozen-condensate clue

What Does Error E133 Mean?

Baxi defines E133 as a failed ignition condition. In freezing weather, a blocked frozen condensate pipe can contribute on installations with an external condensate run, but E133 is not a frozen-pipe detector. Fuel supply, ignition, flame proof, condensate, venting, and controls remain professional diagnostic branches. Applies to: Baxi domestic boilers covered by the manufacturer E133 guidance This guidance applies only to Baxi boilers whose own user or service instructions list E133. Product generation, country, and fuel setup matter; confirm the complete model before using any reset or thawing instruction. Owner-safe checks: Confirm the full model and weather, check other gas appliances, and inspect only an easily accessible ground-level external condensate section. Qualified technician: Inaccessible or internal condensate, recurring freezing, gas supply, ignition, electrode, combustion, vent, flame-proof, and sealed-case work require Gas Safe service.