Listed below are the common Potterton fault codes as described by the boiler manufacturer along with a possible cause.
Promax Combi, System, and Store Error Codes
Potterton Promax Ultra, Gold/Titanium Combi & System Boiler Error Codes
Potterton Assure Combi and system Boiler Error Codes
Potterton Error Code E133
If you are seeing the error code E133 on your Potterton boiler, this means that your boiler condensate pipe is frozen. A frozen condensate pipe is something that can be fixed quite easily yourself if you feel confident enough. There are a few ways you can thaw a pipe out yourself without having to call an engineer.