I don't have vinger to mix or soda plz help what else can i use? Just below, we have a list of common questions relationing to the fault code on the baxi boiler. If you are a homeowner and it's time to replace your old boiler, or an installer that needs to replace an existing potterton boiler you might want to think about changing it for a newer, more efficient model. Please click below to play the video! I am extremely pleased with how solv perform.