My Evohome system has been working fine for about 5 years but now I have 2 controllers (or valves) that are misbehaving. In both cases the HR92 is failing to shut-off the rad when it reaches the set temperature so whenever the pump runs the rad gets heat. The HR92 is making all the right noises and almost closes the valve but doesn't quite achieve it. I've recalibrated the strokes several times, and the batteries are OK. If I remove the head I can shut-off the water by turning the black knob a little further.
I think my next step is to reset the heads, and then to try swapping a head from another zone, but I'd appreciate comments and suggestions.
I think my next step is to reset the heads, and then to try swapping a head from another zone, but I'd appreciate comments and suggestions.