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Thanks Chris, Your diagram is very useful, it is item 424 (or what it plugs into) that is clicking every second, I assume this will need replacing and that it's a non serviceable part? Where would you locate a vendor for this? Many thanks Paul

Hi I have a nother Baxi combi 133he plus exhibiting problems with the same area. The unit has been funtioning well and has only been installed for say 18 months and used for 12 months. The Honeywell VC4012 is making clicking noises every 2 seconds almost as though the pilot needs to be...