Help needed with Honeywell st6400c programmer - erratic hot water | Bathroom Advice | Plumbers Forums

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L

lackingwater

Hi

Would anyone be able to give some advice - we recently moved in to a rented flat with a Honeywell st6400c programmer controlling the heating/hot water settings. We reset the programmer, and programmed the timings to when we want the hot water to come on (on the 'auto' setting). However it is very erratic and does not come on when set, particularly in the mornings. Any ideas for what the first thing to look at would be?

Thanks
 

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