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Vaillant no power. Switches on for few seconds only.

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Hi everyone,
I'm hoping to get some advice on an issue I'm having with my Vaillant Ecotec Pro 24 boiler (R1 PCB). It was installed in 2013 and has worked perfectly up until this week. When the boiler does start, it runs for a few seconds, makes some noises, and then shuts down again. I've checked both the fuse on the wall and the fuse on the PCB with a multimeter, and they seem to be fine (if there's a way to double-check the PCB fuse, please let me know). The boiler has never had any issues before. We've always maintained the boiler properly, and it's never had to heat water above 55 degrees for central heating or kitchen use.
I've attached a YouTube video of the problem: that might help diagnose the issue.
Any advice on what could be causing this problem would be greatly appreciated!
 
Hi Did you solve the problem with your Vaillant Boiler? Please share how it was solved so that it can help anyone in the future with the same problem.

Many Thanks
 

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