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Boiler keeps switching CH on and off

Discussion in 'Plumbing and Central Heating' started by Bradshell, 30 Nov 2018.

  1. Bradshell


    30 Nov 2018
    Thanks Received:
    United Kingdom
    Vaillant turbomax Boiler and central heating in the new house was working fine about 2 weeks ago. I took off a rad to decorate and after fitting back and bleeding etc all seemed fine but the CH keeps cutting in and out.
    The pressure got quite high so i bled it all again and then thought maybe i have a blockage or an air lock. Checked all the rads and they all get hot. Even used a Flir thermal camera. All look spot on. So far i have swapped the pump for a spare and new pressure vessel as water was coming out of it. Ive had sentinel x800 in for a week and also cleaned the Magnaclean 3 times now.
    I cant suss what is making it cut out and back in so often. The temp dial is set to about 60% for the heating. I bled the pump etc also.
    When i ramped up the temp on the dial the boiler worked for longer until it got hotter in temp then cut off. Lower the temp and its cuts out sooner and then fires up when the temp drops a little bit.
    Im Getting hot rads but it wasnt cutting in and out before.
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