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Vaillant thermocompact 628E gas boiler - not working. Seems as though no power getting through. I had a to replace a switch where some drops of water had leaked into that supplies the power to the boiler, but having doen that it still seems that there is no power as the digital display is blank and none of the lights are on ? any suggestions or must I get a spark out/ cheers

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  • janev50 Jan 14, 2009

    The same problem has occurred on my thermocompact boiler. No display, nothing.



    Jane

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Dear Prockie..

First, find the wiring diagram and a voltmeter. Attach one lead of the meter to a good ground. Then trace the voltage as laid out on the diagram. For example, if you have voltage to a switch or device, but no voltage out, then that device may be defective. Check all connections. Your boiler has "self diagnostics" but with no display a simple power problem is indicated. If you have no wiring diagram check with the manufacturer online.

Ray

Posted on Nov 16, 2008

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