Hi Lisa
I have a similar fault on my Potterton EP2000 i.e. clicking when I have both CH and HW on at the same time, but OK when EITHER CH or HW is on. I am replacing the EP2000 today to correct EP2000 fault. The resetting of your timer is probably due to a "dead" battery. Try replacing it.
macnish
macnish
January 2009