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Thanks for the info Tony, I will check it out again. The pump was new about 14 months ago, but you never know. Just about to check the header tank when your reply arrived, will let you know how I get on. :P Once again many thanks. Chris.

I have a Glow worm Fuelsaver MK2 40B boiler, which has now started with the following problems. (1) The pipes out of the boiler are banging, and I mean banging. (2) If I turn the gas boiler heat up past halfway, then the banging cause the flame to go out. Is it on it's way out? :(

The program timer keeps tripping the fuse box. The electrician who called say's he need's to know what wiring plan it is on the Glow worm, before he can sort it. It is definitely a wiring problem. How can you tell what the wiring plan diagram is for this boiler, ie S, Y, C etc? The...