Want to check a few things before you call us? Easi-plumb are looking for gas safe engineers. Get our monthly special offers, great deals and latest news - direct to your inbox! Here, we're going to discuss the fault code on the baxi boiler. Anytime plumbing works hard on every job! If you have an unsightly expansion tank in your attic and a large water cylinder covered in green foam insulation, you’ve got a conventional boiler. Is your network connection unstable.