My Randall 102 time clock has 2 faults....(1) the time clock is not going round, its "ticking" but not moving;(2) when "heating and hot water" or just "hot water" is selected, the water does not heat up...however, it used to!
Any ideas...? Could replacing the timer solve these problems? Any help much appreciated

Steve, November 2008

water does not heat when on heat water only,

Sandy Rennie, June 2010

Easiest clock ever to change.No need for an electrician.As long as you get the same clock you just undo the screw underneath pull the unit upwardly and it slides off the backplate.Then just slip the new module on the existing backplate and refit the screw.Done in two minutes flat

Tony S, November 2008

yes this is likly to be the problem check fuse spur if installed and change timer.

a1 boilers, November 2008