Vaillant EcoTEC Plus 837

[Lectrician]

I drained down my rads to add another, and have refilled the system.

I put the boiler into test mode 0 (CH and DHW bleeding) instead of 6 (filling).

The rads are all working fine, and warming up, but I open the HW taps and there is just no flow at all - nothing.

I had this happen last time I drained down and re-filled, and cannot remember what I did to cure it?!?

How and why does the boiler prevent any flow to the taps?

 

[bobw1956]

both filling loop valves should be showing the word closed when viewed from the front.you have one valve in the open position.

 

[Lectrician]

Thanks!

How foolish!

All working as it should.

Did not ever contemplate that there would be some kind of interlock like that! I thought the filling loop was just a boring old filling loop!

Thanks muchly! I can relax again!

 

[Lectrician]

And looking under the boiler, I can now see how!

 

[bobw1956]

No prob, s

 

[flanners]

im sure you have solved this now but make sure both grey taps under the boiler are horitontal.