Baxi Solo boiler fault code 433

Hi Everybody,

My three years old Baxi solo boiler is constantly showing a fault code i.e. 433. It is quite irritating as due to this, the boiler is not working & I am unable to take shower or do my household chores. Has someone faced this issue? If yes then, please tell me that what should I do?

Thanks for the suggestions


Hi Adam,

According to the Baxi solo boiler’s user manual, you are having an issue with your boiler’s heat exchanger. When the heat exchanger reaches beyond the certain temperature i.e. 95 degrees, PCB notices that there is a potential problem & eventually locks out. The major reason behind this issue is sludge & limescale buildup. The ultimate cure is to contact an expert boiler engineer.