I wonder please if anyone can help? Our Drayton tempus 3 timer is playing up. When the heating is on the timer keeps switching off and on. The problem is intermittent, sometimes it does it all the time sometimes not at all. It doesn't happen when just the hot water is on. I've reset it by pressing in all the buttons in but with no joy. Before I get an expert in to look at it has anyone got any suggestions? I notice from browsing the web that Drayton do a Tempus 6 and 7 now which appear more user friendly. Has anyone got any views on these?