Possible 2 port valve problem?

[Jimbojones1980]

[h=2]2 port valve problem maybe?[/h]

My Boiler doesn't fire when the hot water is on. If I manually open the 2 port valve the boiler fires for a couple of seconds then shuts off again. Any help would be much appreciated​

 

[SimonG]

Needs the testers out and into the wiring center. Best to get somebody who knows there way around an S plan.

 

[mfgs]

It sounds like a control problem, get the multimeter out and follow the voltage through each stage.

 

[joni os]

See this morning's post" Boiler not firing on one channel". When you open manually contact is made with micro switch and boiler fires.