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Thanks for replies. I will test the contacts suggested. For the sake of £40 i'll get a new unit anyway, else it could cost me £100 to be told that! At least i'll know its not the unit if i just remove old and replace like for like. Paul

matilda, many machines can boot from CD. During start up check, if poss, the dialogue that scrolls up the screen (usually quite quickly) for a line referring to an 'Function' key, usually F7 - F11. When pressed during start up, your machine will enter a boot menu, listing all available...

Just thought i'd check the wider community for some advice before i spend money unwisely. My gas central heating system has been running faultless for over 3 years using a ST699B1002 control unit for the water and heating. Within the last 48 hours the hot water timer section in the...