One diagram shows the operation of the VRG141 valve and the other the operation of the VRB141 valve. Now, think about phoning this through to someone - easy for them to hear G as B or vice versa, or if you're just a tiny bit dyslexic, or rushing, its easily missed. Looking at the diagrams, they are much the same - four holes in the valve, and a paddle in the middle.
But the difference between the two was enough to stop my heating system from ever working correctly. I spotted it by chance - nosing around to find ot what the valve actually did, and I just happened to notice a subtle difference in the letters between what the installation manual called for, and the user manual and the empty box that I was looking at.
The one I want is the VRB141, and it's the lower picture, but the one I've got is the VRG141....
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