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    BOILER wont turn on and all light say it is working fine

    Hi. I have a Vaillant VC/VCW 254 XE combo boiler. First off let me say, I DO NOT have a digital display, there is no way to see "error codes" and the boiler works fine when the flame is on. Now first, I have to turn the boiler COMPLETELY off and wait for about approx 30 minutes and turn it back...
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