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I have often been called to look at a system where the householder claims the there is a fault with the thermostat/s. Generally in my experience I usually find. 40% operator error or misunderstanding of how the system works 50% poor installation and location of the thermostat / TRV's which will...

From a wiring point of view, to control a Y-Plan with stored hot water and central heating you will need a Hive Dual Channel Receiver. This would replace your existing programmer, and depending on the make / model it may be a straight swap. The Hive kit comes with a room thermostat which will...

Peppermint?

2 COM = A 3 NO = B

There's another thread where the OP wanted to do the same thing as you. You can read it here.

No I wouldn't "recommend" it, I was answering your question about how to turn a two zone system into a single zone. Personally, I would do it properly and keep the two zones. The idea behind the building regs introducing the two zones is to save energy by allowing you to operate the heating more...

Usually the motorised valves are physically next to each other, so if you were to connect the upstairs valve to the downstairs valve wiring terminals they will both open together. Just a word of caution though. As you already have two heating zones, I'm assuming your property is fairly new...

I think you have posed your enquiry in the wrong forum, which is why no one has responded. If you look at the description for this forum which is called "my projects" it says: Your post would have been better suited to the Plumbing and Central Heating forum, where the guys in the know about...

Yep, that's it. CH1 on H37XL 1 = PR3n 4 CH2 on H37XL 3 = PR3n 6 HW. on H37XL 5 = PR3n 3 Assuming of course that your old wired thermostats are still connected as they were originally.

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.