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Mine was the original post and I apologise for not replying when I found a solution (i guess I was worried that it was only a temporary fix!). I too believe that the fault was caused by components getting too hot, which would explain why I was able to get a the boiler to work ok with the...

Right, thanks for the diagrams these are the same drawings that appear in the instructions but that is a useful resource nonetheless. The pump does run continousely when the boiler fires and the overun stat appears to keep it running for some time afer the burner shuts down. *** An...

Thanks for such a comprehensive response! I shall do my best... 1. There hasn't been any work done over the summer (I dont think anyone has touched the system for well over a year now). 2. The fuse in the socket controls the boiler is 3amp and I presume this is the only supply of power to...

Is a 'central heating sensor' a common feature and if so where would it be located? I am still wondering whether its just the boiler overheating - the last time it tripped it was incredibly hot to touch, is it possible that the sensor regulating the temperature of the water in the system is...

That is correct, since the system seemed to work when set to HW I was trying to isolate the 3 port valve motor. Interesting and frustrating! The fact that it tripped this morning makes me think that it is something over heating: For HW only the boiler doesn't need to be on for too long a...

tryitandsee, I haven't isolated the room thermostat, although I have tried running with it set to both above and below ambient temperature. Also, this morning I left the boiler set to HW, removed the 3port valve head and manually twisted the spindle to HW+CH. The power again tripped after 20min...

I have a Myson Apollo 30/50 boiler, fitted with a manual programme ring. The programmer has the choice of Timed/Off/Continuous, HW/HW+CH and Low/O/High thermostat. The system is vented (there is an expansion/feed tank in the loft) and configured as a Y plan. The pump is a Grundfos 16/50, the...