I had the same problem a few years ago. The Honeywell helpline were great with suggesting a replaciment and reworking the wiring for it.

We have one of those in the conservatory and the display went blank.

They still appear new on eBay & Amazon (mine was from there) maybe others as well, but contact Honeywell first as Adam says.

Edited By V8Eng on 04/10/2022 13:53:30

If you have the external weather sensor fitted to your boiler and set up properly – and I recommend that you should – then a Nest or Hive would be a bit of overkill in my opinion. You just need a simple timed thermostat. Personally, I'm not keen on wireless ones, but if you have a look here, you'll find a selction. I'd go with the Drayton or Siemens myself, but not sure what features you are looking for.

Links to https://www.heatingcontrolsonline.co.uk/wireless-programmable-thermostats.html?limit=100

No connection other than as a satisfied customer

Rob

I've got an very simple controller. If the house feels cold I turn the heating on for half an hour, or an hour if it's really cold. The rooms we occupy have their own gas fires. SWMBO could not cope with radiator thermostats: just because the rads have gone cold because the room is hot enough she thinks there is a fault

I fitted a Tado recently to replace a wireless Honeywell device. As mentioned, it uses a phone app to control the settings. It was a little fiddly to wire up, but the installation guide that comes with the app is very good and the support from Tado was excellent, with very prompt responses. Now that it is fitted, it is simple to use and appears to be very effective.

James.

I installed a NEST thermostat 5 years ago, works great (still). Best thing I ever did, replacing the old mechanical thermostat.

Smartest looking one on the market.

Remember, the dinosaurs are not extinct, they just moved onto this forum………

Edited By Howi on 05/10/2022 10:58:42

I've installed three Tado units for friends and family. All are working very well. Can't remember why I opted to use Tado over the other options such as Nest etc. Installation is straightforward but recommend you download the professional installer notes.

The thermostat can directly replace a wired old style unit. If you want to use it 'wireless' you need to install the Extension Unit at the boiler (again straightforward to do). Either route there is a dongle to hang off the WiFi router that acts as the comms hub.

Using the Extension Unit means you can move the thermostat from room to room to reflect where you need the heat to be focussed. You can also add WiFi connected radstats to the network for localised control.

Profile programming is from a Smartphone or from a Desktop. The profile is stored on the Tado cloud which will immediately horrify the anti 'anything to do with the cloud even though my banking is' fraternity. If your internet connection goes down you can still control the thermostat in non profile mode.

The smartphone control allows you turn up the CH and water as you exit Arrivals making homecoming a much more pleasant experience. The app provides various stats on usage and consumption. If you want it, it also uses geofencing to turn the temperature up or down depending on whether it detects your phone is at home or not.

The media would have us believe that we are heading into a serious situation over winter with fuel shortages. They also, probably correctly, imply that the more senior members of society will suffer the most from an inability to heat their homes.

I would guess a significant number of these homes will have the traditional single mechanical thermostat located in a draughty entrance passage or similar. This is not an area of the house that they will choose to hunker down in as temperatures drop.

I can see that a wireless device close to hand controlling their immediate surroundings and not wastefully heating the rest of the house would have its attraction in these circumstances. As to whether a blob of mercury in a glass bulb is more reliable than the latest tech gizmo I am not privy to the facts to be able to objectively comment.

I despise the new electronic thermostats, and electronic devices in general.

The problem is no two operate the same. You can't repair them either.

In my older car, it has some simple buttons for heat and air.

My new car has a computer screen, and you have to have a PHD in physics to navigate through the multitude of levels, even to do something simple like reset the clock.

The electronics in microwave ovens do seem to work well.

People don't seem to know how anything works anymore; they only know how to use apps.

My central air/heat system has an electronic control module, and when it goes out, it is about $300 to replace.

My daughter's central air/heat has a gas valve with thermocouple, and there are no electronics to go out.

A thermocouple is about $25.00, and they last for many years.

I am seeing a worldwide shortage of chips/electronics in general now, and so does anyone know how to go back to mechanical relays? I do, but few others do.

And I don't like to be a slave to a smart phone and its apps.

When I retire, I am going to be phone and app free.

For similar reasons, I don't have DRO on my shop equipment.

I aways know that when I got out in my shop, those hand knobs will always work, and never break.

I do use digital vernier calipers.  The batteries don't last very long, but I can't really live without digital calipers in the shop.  Electronics do have their uses, but they seem to overload everything with electronics, more as a marketing thing.

My daughter's new car has apps that the car company tries to get you to subscribe to monthy, so you can use all the features of your car.  This is basically blackmail, in my opinion, but his is the trend, and there is a term for it, which I forget.  Soon there will be an app to use the loo.

Edited By PatJ on 05/10/2022 16:11:59

My Nest was defeated by my wife, she is incapable of regulating her temperature it would seem so the Nest finished up with hundreds of learned points. I took it out of learn mode as it is impossible for any machine to learn what temperature my wife requires. Even with driver and passenger zones in the car she fiddles with the set point constantly.

Mike

Good luck!

When I moved to my current house, I found a system with a CH timer, mechanical TRVs on all radiators, and no central thermostat. It's a funny-shaped house but suited to zoned control – why heat bedrooms during the day? – but first step was a wireless thermostat in a central position (to avoid wiring problems). I ruled out a zone-valve based system partly because of the awkward shape of the house and plumbing access difficulties so went to wireless radiator valves with a central controller. I went Honeywell but there are a number of versions around these days including open-source options. It does give good control, local room override, app-based control if desired, and generally working well. Rad valve batteries need replacing every couple of years or so but overall I think the technology saves money, gives better control, and a more comfortable house then the alternative less-sophisticated systems. Sometimes, the bullet-proof dinosaur systems just won't do it!

That said, I'm very reluctant to update my boiler which is very old-school with cast-iron heat exchanger and no electronics inside…