Vaillant turbo max vuw gb 242/1e gas ok, water ok, led lights on except gas light. Is trying to ignite but just clicks
More likely the thermal coupling is u/s get new one fitted
Try resetting the little red stat right at the back on the left hand side , the little button is under a transparent rubber sleeve between 2 wires
Possible defective gas valve, if boiler is trying to spark, get corgi engineer to investigate
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