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Thank you very much, will get back in touch with photos soon, got a baby on the way in november and would love to get the heating on a timer, very grateful for your help

I have recently moved into a house with a very old honeywell control panel, st699 or st799, everytime i set the clock for the automatic timer it resets to 00:00 after a few hours, have looked into fitting a replacement, the ST9400c, is this a straight forward job? Im confident enough with wires...