vaillant eco tec plus

  1. S

    Vaillant eco tec plus 837 continuously 'loading'...

    Hi, Any heating engineers able to help? Apologies if previously covered. I did try and search. Just arrived back from holiday and our boiler won't start up. The screen won't power up and is just continuously flashing 'loading'. It doesn't get as far as showing any error codes. It sounds like...
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