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Thanks for the replies folk, turns out the 2 port valve for the hot water actuator had been mangled by the previous homeowner and they had damaged the switch inside causing it to always be on!

It would appear that the first valve is a 2 port feed from the boiler to the water tank.

It's not a combi, we have a hot water cylinder which is boosted by a solar water heating panel and then again by a solar iboost which heats using our surplus generation with an emersion. Yeah we have 2 heating zones, upstairs and downstairs, I'm unsure what should control the first valve...

I haven't installed the nest yet, the actuator I was talking about had it's motor replaced and has been working fine since. We just moved into a new house so are trying to get our head around how the system works. It fires on for around 5 minutes at a time, half an hour or so apart. Yeah, it...

Quick one folk, Even with my programmer set to off for both zones and hot water, the boiler seems to fire up every so often to keep something warm. The freeze thermostat is turned right down and both actuators for the zones appear to open and close as requested by the programmer. Any ideas why...

Good morning, I've had a look at a few threads featuring a horstmann H37XL however the wiring on the posts is slightly different in that our box has 2 lives, earths and neutrals. Our central heating is a 2 zone controlled by Drayton ZA5 aculators, oil fired and currently using the horstmann...

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Cheers for the quickwquick reply. I thought that might be the issue, just need to work out why it's only getting 20v now! ‍♂️

Afternoon, First post on here but you all seem like a really helpful bunch, hoping to find the problem with my valve. When called for heating there is no movement in the motor, we put in a new one just incase and still nothing. I've measured the voltage across the points powering the motor...