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  1. S

    Vaillant thermos compact VU 242 intermittent lock out

    hi, I’m new to the forum, a plumber for 30 years - I have the above boiler and am getting intermittent lock out. I’ve also noticed when topping up the boiler, if I leave the filling loop,open it won’t charge above (not that I want it to) 1 1/2 bar but normally when filling loop is open a boiler...
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