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There's a link here. Other 3 channel programmers are available :) I can't give it a review I'm afraid as I've never used one, but interestingly the wiring diagrams look remarkably similar in style to the Horstmann programmers. :unsure: The terminals are in a different order, so some minor...

If the original thermostats have been left wired in as they originally were, you should find that turning them up to their maximum setting will allow the PTD's to control the heating. If the H37XL is faulty and you can't find a new one, as they are no longer manufactured, then another 3 channel...

They are different devices and the wiring is different. H37XL is a 3 channel programmer which as you can see below requires separate wired "room stats" and "cyl stat" H3747 Is a 4 channel smart thermostat that communicates wirelessly with PTD's (Programmable Thermostat Display) There are no...

If it's been wired correctly. It will be necessary for both the timeswitch and the room thermostat to both be 'on' together for the heating to operate. If either are off, the heating should be off. Setting the timeswitch to be permanently 'on' will then allow the room thermostat to have total...

The boiler ebus connection is provided by Valliant to work specifically with other Vaillant products. It doesn't work with Nest, Hive, Honeywell et-al that don't have an e-bus interface Your boiler can be wired to work with other controls, but not connected via ebus. If this is a new boiler...

Not sure of a kit per-se, but I've seen a single Sonoff Wireless RF/WiFi Smart Switch paired with a wireless RF bellpush. The Smart Switch provides a 230V output that could be used to operate a 230V relay. There are other versions of Sonoff that have voltage free contacts built in so wouldn't...

Not if it was working correctly before the fault occurred. It sounds more likely that just the label is wrong. If they were transposed electrically the hot water would come 'on' when the only the heating should be 'on' and vice versa.

There have been a few discussions on the mysterious red light previously. There's one here.

Inside each of the valves is a small microswitch controlling the boiler. When the valve opens the microswitch operates and the boiler springs into life. From you description of the symptoms it would sound like the microswitch inside the hot water valve has failed, (or there is a broken...

My experience is with heating system controls, but along the way I've picked up some basic info from the plumbers I've worked with, and as no one else has commented so far........ I would say probably not. Gravity circulation requires the use of large bore pipes 28mm as a minimum. This is...

I would have thought so, but as @George_engineer suggests have a chat with the pro's. My limited experience is with a larger A/C installation not split units.

OK thanks I've amended It, and my apologies for the error. happy now?

Some electric underfloor floor heating is designed only to warm the floor surface so that it's not cold to walk on. It's not intended to physically heat the room. So obviously, any UFH would have to provide sufficient heat for the size of the room. Off the top of my head, I would estimate that...

How it works, is that when the timeswitch and thermostat are both 'on' they are wired to a motorised valve. When the valve winds open it operates a microswitch inside the valve, and it's this microswitch that starts and stops the boiler as the valve opens and closes. It's very common for a...

You don't show the full picture of the boiler controls. Usually there is a timeswitch included. Item 10 below. If you do have the timeswitch fitted you now have two devices installed trying to do the same thing. The Boiler Timeswitch and the Honeywell Programmer. So, the timeswitch is usually...

And a basin. ;)........

I would have said 'evaporator'. However, based on the previous comments, I'm not sure whether you are looking for the individual component, or what that component makes up a part of. Anyway, the diagram below has the name of the various parts.

I did say that ;)

I came across this once with a 3rd Gen Nest, but AFAIK it was never resolved. Here's the info from Nest. "In many cases, your Nest thermostat should be able to control water temperature with a combi boiler that’s OpenTherm compliant. So, you can turn up the water temperature in the winter for a...

The Hive Kit, also contains a Hub that connects to your internet router to allow remote access. If you were to add a single zone Hive for upstairs you can use the same hub.