clock stopped on Vaillant bolier?

Can I just ask, not being a very technical person, does isolate the electricity mean unplug the boiler?Thanks for your help,

liz
December 2011

If it's the internal type of timer (on the front of the boiler), it's a straightforward change, ensure it is electrically isolated, gently prise the timer out of the boiler cover (a small flat blade screwdriver or similar will do it), and insert new timer offering it up squarely to the gap so that the pins on the rear of the timer line up with the holes in the cover of the boiler.

Carefree
December 2011