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Couldn't be sure if they were tested although apparently the thermostats were changed (plumber 1 did this). This didn't solve that particular problem and the second plumber believed it was due to a scaled up heat exchanger although advised that the boiler was also underpowered for our house. He...

Interesting - thanks so much for that. The company were adamant that it could really only be a leak in our pipes - I'll call them back again tomorrow and ask them to come out to check into it. Sounds like you've come across this issue before. It's annoying as they convinced us to install a...

Yes indeed - Grant Vortex Combi 26e. Sealed system although not sure against your question there.

Thanks for the replies guys. Got back home tonight, checked the boiler - pressure zero & low pressure light on this time. Repressurised again to get some hot water for tonight and as soon as I turned the boiler back on, it started to drop from 1 bar slowly down. Went outside to check...

Hi everyone, We've recently had a new Grant oil condensing boiler (26K) fitted by a reputable local firm which, other than a faulty flow switch which was changed after a couple of days has been working well. Recently, after 2 or 3 weeks of its installation the boiler has been firing up at...