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Thanks all for your suggestions. The zone valves have indeed been fitted the wrong way round :(

How should the valve be oriented relative to the flow direction? I didn’t see any reference to that in the leaflet that came with the valve.

I’m intrigued. Is there a wrong way round, then?

I've just had a Worcester Greenstar boiler fitted to replace my old Ideal Minimiser SE. The old boiler did not has a pump run-on requirement and so bypass was fitted. This Greenstar does require pump run-on and so a bypass was fitted. But now, when the last zone valve closes with the pump still...

I've just had a Grundfos UPS2 replacement pump fitted which also has both fixed speed and 'Proportional pressure' modes. I tried to quiz Grundfos as to how their PP mode works but couldn't get any sense out of their Customer Service team other than the fact that the pump has no pressure sensor...

I’m close to having an automatic bypass fitted to my system in the hope that the reduced load on the pump might solve the micro switch problem. What does anyone think? However, the relay idea seems a good one, but currently beyond my capability. Do you have a wiring scheme that would guide me...

I have used the genuine part (currently offred on eBay here http://www.ebay.co.uk/itm/BURGESS-XCG3-Z1-MICROSWITCH-V4-PLUNGER-/271177861837?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item3f2375cacd) but haven't considered an alternative. What is the Maplin's alternative? (Might be worth a...

I have changed microswitches by de-soldering the connections an soldering them to a new switch. It's a bit fiddly since the parts are so small, but can be done. I've uploaded a photo of the microswitch in situ. Martin

Thanks, the actuator is a Drayton ZA6. You suggest Honeywell as a better alternative? Will alternatives be interchangeable to be used on the same valve? Martin

I have had repeated problems with one of my 2 ZA6 actuators, with its microswitch not switching when the actuator is commanded to close the valve. The result is that the pump and burner continue after the flow has stopped. The condensing boiler doesn't like that, obviously. I have sourced and...