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I switched on the immersion heater in the boiler (mistakenly thought it was the hot water switch for the central heating) and so I have hot water. BUT now can't tell if the boiler/ rest of the system is producing hot water. I have switched it off now (i.e the immersion heater) and will wait and...

Hi there This link http://cgi.ebay.co.uk/LANDIS-GYR-RWB2-PROGRAMMER_W0QQitemZ110062019088QQihZ001QQcategoryZ3191QQcmdZViewItem#ebayphotohosting shows an image of my programmer. Basically, I don't understand what the various switches do and have been unable to make the heating come on in my...