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E133 for a Baxi says frozen condensate pipe. Doesn't sound likely...
https://www.baxi.co.uk/faqs/what-does-error-code-e133-or-e28-mean
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I've got a Main boiler, same company as Baxi. Although online stuff seems to show condensate pipe it's actually failure to ignite as konstab said.
I needed a new ignition electrode on mine (surprising as only about a year old). Boiler engineer diagnosed it and I fitted it.
I used this guy who was very good. Not sure what area he covers https://rokas.london/
My angry slash exasperated post should have clarified I have pressure back to correct. Zero signs of leaves anywhere in the house. No dice on resetting boiler per instructions… just error code E133… why does this stuff only ever break on Sunday evenings? sobs