Hot water constantly on despite timer being set to permanently off?

Has the system been functioning correctly at all since the timer was fitted? If not, then the timer has possibly been wired up wrong.

If the system has been working correctly since the timer was exchanged and this is a "new" fault, I would suggest looking into a fault with the motorised valve... Possibly a stuck micro-switch.... But check the wiring on the timer first.

ccMods
August 2006