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Thanks Ian. The boiler is in the house. The pipestat is between the motorised valve and the cylinder. I had read about this cycling on and off elsewhere on the forum and there were some recommendations about having the cylinder thermostat set 10 degrees lower than the boiler thermostat. That was...

I would like to understand the issue before calling in my friendly local engineer. Over the winter our 8 year old boiler has been fine but is now firing up for a couple of minutes stopping for a couple of minutes then repeating the cycle house rads are all switched off only the cylinder is on...

Thanks again Matt, We refitted the unit in the vertical plane and ( you were quite right Matt) had a similar result!! Fired up for about a minute then pressure soared, a couple of bangs and the gas cut off, this happened several time. Pressure vessel pressure checked, no kinks in pipes etc...

Many thanks guys for the advice. My little brain has been working overnight on this as well!! The existing vessel is mounted horizontally in the boiler, I though it would be good to mount my new vessel horizontally as well, partly for space and also so I could easily check and top up the...

My sons boilers pressure vessel was leaking at the air valve. We understood that the 'simple' fix was to get an external vessel fitted and there was room for one below the boiler. He could not get a local plumber to fit one so after reading and watching a video we thought we could do the job our...