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Noticed it was cutting out when running a bath , weather has been lovely recently :D

My Vaillant (don\\\'t know model - Gas No 47-044-15) runs ok with heating and water for approx 20 mins until it is hot , the boiler then cuts out and pilot light goes out. The boiler appears pretty hot and i\\\'d say the rads are hotter than usual. Someone mention clogged filters ? could it be...