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I recently had the fan changed on my Volkera Excell 80 SP Boiler everything has worked fine for about a month, however i am now getting intermitant hot water. It seems fine in the morning when i first turn the shower on but for instance if i put the cold tap on for the basin in the bathroom the...

I have a Vokera Excell 80SP the pilot light is on however it is not firing up for either Hot water or Heating I have taken the front cover off and there is a ( can only descibe a humming noise) that has replaced the normal running sound of the heater before . If i press on the internal metal...