I inherited a Potterton Housewarmer 55 when i bought my house that keeps locking out. It used to do this a while ago but stopped when i had it serviced. Since then, the father-in-law came to install us a wall unit, and knocked the programmer (Lifestyle LP241) off the wall. He rewired it (thought he knew what he was doing). I have had an electrician look at the wiring and he has now corrected, but he admitted he isnt an expert on central heating. There are 2 problems, when the heating is turned on, the boiler locks out, and secondly when the programmer is not set (but boiler not locked out) it still ignites the boiler every few minutes until eventually locks out, but radiators don't get hot. I have a friend who is a corgi registered engineer, but he doesn't want to waste his time if the wiring isn't correct. If the wiring were incorrect, would that be the cause of the problems stated above?? Sorry about the essay, but i thought i had better try and explain as much as possible.