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Just to loop back - replacing the valve insert fixed the problem. Using the decorators cap on the actuator valve also saved having to drain the system. Thank you all for your help and Happy Christmas!

Hello @MrUFH I have the part on order thanks to some excellent support from Nu-Heat. For anyone else the part number for the pin valve insert is DZSW24-C available on their website. Once it arrives I then need to figure out if I can replace without having to drain down the whole system. I’ll...

Thank you again. Really appreciate you taking the time to help.

Thank you @Madrab! Will I need to replace the head too? And when you say replace the valve, is that just the insert at the bottom or the whole brass block? Either way knowing what part to order is my challenge. Unfortunately, there don’t seem to be any other isolation valves so your tip on...

Thank you for your reply - I have previously tried some slightly over gentle tapping without success. Some more photos attached.

Your help please… We have wet underfloor heating in our kitchen and it hasn’t worked since moving in a year ago. I have now decided to try and fix it as the floor is painfully cold. The Grundfoss pump appears to be running and the actuator pin moves freely. However on removing the thermostat...

Realise question above was for Stuckinarut!

Thanks for your reply. If a standby mode. Is that normal for the boiler? It occurred to me that this might be a cooling mode post burner.

Hi, We have recently moved house and now getting to know our Camray 5 boiler. I have replaced the old thermostat / controller setup with a Nest Heatlink and that is behaving as expected. The call for heat on either CH or HW fires the boiler and when turned off the boiler stops firing...