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Well, the problem has recurred and I've now done further troubleshooting. As I surmised it appears that the issue is the overheat thermostat. I have (temporarily) removed and bypassed it and the boiler works normally eventually cutting out in accordance with the low or high thermostat. Now I...

Well, how bizarre. Things have settled right down with, according to my wife, no recurrence of the spontaneous cycling phenomenon at all during today. I'll keep this thread updated if/when things progress further. Meanwhile, fingers crossed. :lol:

Phew. Neither do I.......I was being a little bit 'tongue in cheek' :wink: I am an electronics engineer by training with expereince working as a service engineer in the pump industry so I can indeed check voltage levels safely. Most importantly I do know my own limitations - as far as I am...

Full monty. Burner out, little nifty hoover thingy applied to every nook and cranny........ Either those smarter than me think that the guy who serviced it broke it but it's taken 6 months for that to show up or there's some other reason for such avid interest in the servicing of my boiler...

April 2013

Yesterday my boiler started to 'act up' and I was hoping that I might get some troubleshooting tips from some people cleverer than I. When calling for heat (or indeed hotwater) the boiler fires up as normal and runs perfectly for several minutes. Once things start to get warm it then starts...