thanks for the advice, boiler stat clicks on/off ok and shuts off boiler! the noise travels along the pipes under the floor upstairs and can be traced up through the pump and into loft tank, it usually happens just after the boiler cuts out but sometimes it will still happen if the boiler continues ...
hi Povetheman here can anyone help with my boiler problem? potterton neataheat electronic boiler, 2 motorised valves, pump, 15 rads & H/W cylinder, all have been working fine until about a month ago when loud bubbling noises were heard in airing cupboard steam and hot water rising up to F/E tank...