My timer on my Valiant combi voiler?

Hi Adam

If the timer is a 103 you can buy a modern replacement 103e, this slots straight onto the old backplate without altering any wires.

Ian
September 2008

most combi heating wiring is a live out of boiler into time clock then a live back to boiler when time clock demands so yes it should be a pretty simple swap.

generally timeswitch will have a common connection (live) and a load connection (switched live).

iain
September 2008