Banging Boiler?

we have exactly the same problem . We have had it regulary serviced by British Gas and they contacted Glowworm about it and were told that it is problem with this boiller pre 86! and cannot be resolved it sounds really "scarry"

Helen
December 2008

It's the boiler over run protection timer, its probably burnt out!, near your hot water tank you will see the wires from the pumps going to a white junction box in the lid of that junction box is a timer that runs when the signal from the thermostat is removed i.e when the tank hits temperature this timer will run the pump for a couple of minutes more to take away the boiling water from the boiler, it is this water that is causing the banging as it is being heated and expanded but with nowhere to go.

Silo
May 2008

Sounds like sludge in the heat exchanger, system is probably full of sludge. Get this confirmed by a registered gas installer, the banging is the heat not being able to disipate, Heat exchanger will eventually crack.

petethepisspoorplumber
December 2007

Get a registered gas installer to look at it.

George Anderson
December 2007