Thanks - sorry I was a few days replying, I've only just had a chance to look.
It turns out it's NOT the plastic housing that's broken; instead the hot water valve tries to open but sticks about halfway; enough to briefly trigger the microswitch and fire the boiler, but then it backs off a...
Hello - we have a heating system that was installed by British Gas around ten years ago. It's got two two-port motorised valves.
These were originally British-Gas branded but as we discovered when one failed they're actually re-branded Drayton ZA5's.
Both the original actuators have...
Not sure which subforum this should be in, please move if I've got it wrong.
Familiar story - leaking sealant round a shower/bath that I hadn't noticed, only became apparent when plaster started to go powdery on the other side of an internal wall.
The whole bathroom was professionally...