I've not long moved into this house and the boiler has started making a squealing noise when you run the hot water, it starts off high pitched, gets lower, then when its gets to a low pitch the boiler switches off, then a few seconds later it fires up again, the water is nice and hot, c/h working fine, any ideas please?

pe2e, February 2007

could be your fan, try giving a little squirt of wd40 on / into fan bearings. If this cures problem then its your fan, the wd40 wont last long however and the fan will need replacing

mr gas, February 2007