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Are any of the boiler manufcaturer courses worth going on? I've got vailant and glow worm booked up in Slough for March - and am thinking of going on the 4 Baxi courses - and a Worcester course.

sort of - I'm not a student anymore, just trying to learn a bit about fault finding on combi's I know they are different and some use different components, was just trying to work out what i missed out!

what causes does a combi boiler have for the hot water running cold or not normally? I can think of: DHW control turned to off/low setting diverter valve / flow switch faulty DHW thermistor faulty DHW pump (if one) faulty and / or DHW pump flow switch incorrect flow rate through boiler...