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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 a gone fuse or does this indicate something else? The external thermostat has power. Any help would be appreciated. Thanks