Hi. i fitted a new timer/programmer to my gravity fed CH and HW system about 18 months ago, a TIARA the same as my old one. It is fitted via a fused spur, i also have a single plug fitted to this spur to charge our dyson. Just recently ,after having no hot water, we found that the clock on the timer was slowing down ,losing about 6 hrs a day. What could be causing this problem ? does the timer need renewing again ? could the spured plug to charge the dyson be causing the problem ? would appreciate any advice. Thanks