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Vaillant 828E boiler cutting out with central heating on

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Vaillant 828E boiler cutting out with central heating on

Vaillant 828E boiler cutting out with central heating on

Hi all, this is my first post here and I am grateful for any help.

I have the titled boiler in my house that I moved into in May. My problem began with two radiators that had issues, one is stone cold and the other gets only luke warm. I have bled these radiators and I am getting pressure out of them so the flow is there. The other 5 boilers in the house get red hot.

I looked at the boiler and noticed this had zero pressure, so I filled this to 1.4 bar. Tested again and still the same...

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by tom-225

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