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Ok thanks. I will see what the next few days bring. I'm actually surprised it has stopped. It's not the solution but for now all is quiet.

Thanks John, and normally, would one throttle this down a bit? Actually, doesn't a 3 way valve normally take care of that?

OK, so I turned the boiler stat down to mid-way a couple of nights ago and since then, no gurgling or clattering. I haven't got my hands on the IR gun as yet, but will check when I can.

Thanks Nozzle! So some satin finish insulation tape or matt black paint. Thanks John, yes, the return of the cylinder was a lot hotter than I would've expected (esp. that I drew down the cylinder and it had cool water in it). I know feeling the rads there is quite a difference - it's usually...

Ok, I'm getting the feeling my issue could be one of 4 items. In no particular order: Boiler overheat thermostat Boiler main thermostat Boiler PCB Hot water cylinder Could it be anything else?

I could probably get hold of an IR gun quicker than a thermocouple. Which pipes are you suggesting I check?

I can probably get access to that item. I'm an Engineer in the Automotive sector.

Hi John, I have a multimeter, but not a thermocouple. What item would I measure?

Hi, this is a over heat thermostat, correct? The central 'button' (looks like a cross) on this popped up a few times. I reset (and got the boiler working again) by pushing it back down. Anyway, thanks for your suggestions. Tonight I turned off the CH and water heating and ran down some hot...

Hi, no the immersion heater is only used in times of need.

Once again, many thanks for the reply and consideration. OK, checking the pipes as I tiptoed out the house this morning, the flow and return pipes were both almost too hot to touch. Hardly any difference in heat. BUT, it was getting near the end of the water heating cycle? Tonight I will drain...

Thanks both, my F & E tank is spotless, well it was on the weekend. I ran 2 litres of PC400 Flushchem for 2 weeks then drained until all outlets were clear. I ran the pump and the incoming water kept up as I flushed out the cleaner. Then added inhibitor. Ok, yes, wrong with combi. It's a...

Hi all, first time poster here, but enjoyed reading the forum up till now. Anyway, we have a lot of noise coming from our CH system when it's in the hot water heating cycle. We have a combi boiler (glow-worm) and a gravity fed system. The noise has been with us for a couple of months now and we...