My baxi boiler keeps showing error code E133 we reset it and it comes back on; this only seems to happen late afternoon early evening, it can happen a few times in one evening then not again for a few days later sometimes a week later, I’ve been told it’s low gas pressure but when I googled it I didn’t find anything about low gas pressure, does anyone know what the problem could be as I’m worried incase the boiler breaks now the weathers getting colder, thanks