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Nope. As i say I think it's a thermistor. It was originally working fine and then I don't know what changed (unless usual wear and tear) but it started having this problem.

It's just being noisy but when i place my hand on the front (outer) panel the excessive vibrations stop and becomes quieter. Regards the overheating this happens rather quickly i.e switch CH on and within 15mins the rads are piping hot. Boiler doesn't cut out but maybe thats cos I switch off...

Hi, Thanks for all your replies much appreciated. Zed :-)

Hi, Our Worcester Boiler 25si discontinued model (hopefully to be replaced in next few weeks) has recently started over heating our radiators to the point where they are literally too hot to touch. So we've just been switching the CH off after an hour or so. From my understanding this is a...

Hi there, We recently (6months) have moved into our first sem-detached house 3 beds. It has a combi boiler fitted in one of the bedrooms (not good) and it is rather noisy. It is a Worcester Bosch 25Si (Old discontinued model). When we moved in we decided that we would either get it serviced...

Thanks for you advice Tipper. The Electrician came down yesterday and said this is straightforward. Made all his connections and.....nothing. Boiler didn't come on and neither did pump. Showed him the way i thought i saw it connected originally and hey presto the boiler came on but no...

Thanks Tipper for you reply. The problem is that i have two 4 core wires (3 and earth) going into the 103 and am not sure where this 3rd core should go. It's really freaky and wierd cos the 4 core coming FROM the boiler has the red core going to Earth!! and that's the only way the boiler will...

Hi, I think this must be one of the wierdest setups my plumber has seen. Here's the situation: The randall 103 timeswitch had some loose and 1 disconnected wire. OK tried putting it all back but something is not quite right. Cos boiler (back boiler) fires up but pump doesn't. Apply an...

Hi, I think this must be one of the wierdest setups my plumber has seen. Here's the situation: The randall 103 timeswitch had some loose and 1 disconnected wire. OK tried putting it all back but something is not quite right. Cos boiler (back boiler) fires up but pump doesn't. Apply an...