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Cheers guys. I have called someone, they are coming tomorrow. It was either error 24 or 27. Its the typical low pressure error, it comes up with the pressure line flashing below minimum.

Hello. Our boiler has stopped working. It's a Vaillant eco tec pro 28. The water went cold, then I filled the pressure up as that was the error on the screen. Now it won't turn on, every now and then it will turn on for 20 seconds then turn off when it starts to fire up. Could it be as simple as...