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Many thanks for all who replied. I am going to have to leave it until after Christmas to solve the problem as we are away for the festivities tomorrow. I will try the valve replacement first as suggested by namsag as it seems to follow our experience. The hot water is also running V hot...

The mud is becoming a little clearer. thanks for the responses. I am interested in the kit you mentioned, but i am still a little confused as to why the boiler would run as it does, with the pump shutting down before the burner, and what is switching it off. It would seem from the previous...

i haven't metered anything as yet, just listened to the pump which can clearly be heard switching, and the vibration of the pump can be felt when it is running. likewise the vibration stops when the pump switches off. If it is the timer that switches the pump, then perhaps it is time to upgrade...

i am not sure. there is a switchmaster 400 timer (h/w&c/h - h/w - constant & timed) and wall mounted thermostat in the hallway. All looks to be original equipment. I did think that all the timeswitch did was to switch power on/off to the boiler when the roomstat called for heat, and that the...

the system as i can see it is a baxi bermuda 520 back boiler - seperate 3 speed circulation pump (possibly in addition to boiler circulation pump), fed by header tank in loft. H/W fed up to cyclinder in airing cupboard so assume it is pumped not gravity. No idea about bypass valves etc, but all...

the age of the boiler is unknown but i expect it is around 40 years old, the same age of the house. The house had been unoccupied for around a year before we recently moved in, and several radiators had leaking valves which i replaced. As i had already drained the system down, i refilled it...

The problem is that the pump appears to shut down before the boiler switches down. This causes the boiler to \\\'boil\\\' the water, with the resultant hysterical popping and banging in the boiler and surrounding pipework which resonates around the house. My 20 month old daughter is frequently...