I'm afraid the spindle/pushrod isn't moving the switches at all so I can't
adjust them.
I can fire the boiler by manually making the switches although it wont
remain lit.
The servo arm on top of the water section moves and returns OK.
I'm going to try venting the boiler this morning and if that fails cleaning
out the control lines this afternoon.

"geoff" wrote in message
...
In message , Son of Fred
writes
Our ancient Vaillant combi (VCW GB240H ) will no longer fire. The
culmination of a series of problems I found to difficult to diagnose with
certainty.


Have you checked the diverter valve microswitches ?


--
geoff