After setting the CH to off last night on the timer, I noticed the rads were still getting warm this morning. The CH is normally set to on constantly & the timing is controlled by a Drayton Digistat in the front room. Changing the settings on this revealed that the CH was firing up regardless of the setting on the timer when the Drayton kicked in. A few months back I did some retiling around the timer & used a steam stripper to remove the old adhesive. I had an incident where steam got into the CH timer & I thought I killed it. However leaving it to dry out seemed to fix it & it worked OK, or so I thought.
Could the steam incident have chimped the relay that controls the CH, or could there be another cause?
Timer is a Potterton EP2002, I've found one on ebay for £23 posted, just wanted to double check before I shell out.
Thanks
CD