IF I AM RIGHT THEN THE ONLY ADVICE THAT I CAN GIVE YOU IS THAT YOU SHOULD CALL A COMPETENT REGISTERED GAS ENGINEER TO DIAGNOSE THE FAULT.
SOME OTHERS ON HERE MAY SUGGEST THE PLATE HEAT EXCHANGER IS BLOCKED. IF THAT WAS THE CASE THEN OF COURSE YOU COULD CLEAN IT YOURSELF BUT I DONT THINK THATS YOUR PROBLEM !
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