Honeywell T4R vs CM927

[Nilly]

After 12 years of faultless service our old Honeywell CM927 wireless thermostat/controller finally gave out. The display failed and although the trick with bulldog clips and hairdryer worked for a while, even that stopped working eventually.

Without really checking we went along with our plumber's recommended replacement - a Honeywell T4R. Its OK and works fine, but it really does lack some of the handy features we liked on the CM927 - namely the party mode and day-off features. We seem to have downgraded functionality unintentionally. Is there a higher spec Honeywell that does retain these features or are they hidden in the T4R somewhere?

P.S Its controlling a WB combi boiler i.e. heating only, not hot water.

 

[Deleted member 267285]

It seems the cm927 had more features.

 

[ericmark]

I found the T4R manual and also note the CM 927 is more expensive so one would expect more features.

I did some thing similar not wireless in my case, but I swapped thermostat due to old one going faulty, and old one really easy to override and new one had to keep book with thermostat to change temp as so complex.

I am not a lover of my Nest Gen 3, it is rather poor as one can't link TRV heads to it, however it has a large display, and easy to turn up or down manually without altering the back ground program.

I am looking for a second thermostat myself, and it does seem Hive is around the cheapest with will connect to TRV heads, in the Honeywell range we are looking at £300 for the EvoHome, with Drayton wiser it depends if you need DHW control, Tado it seems UK models do not connect to TRV heads so although they do a model which can, it needs to be got from internet.

It does seem to be a nightmare selecting both wall thermostats and TRV heads, made a mistake with latter, looked so good but then found only way to control is with a hub and on internet, no way to manually control, this far cheaper unit worked so much better, can walk into a room press one button and either simply turn between eco and comfort settings or run boost, can use phone with bluetooth, but also manual controls. This one does far more than other two, at £35 more expensive than the £15 spent on the eQ-3 models but cheaper than the Energenie and can be manual controlled. To get a linked TRV head jumping to £50.

Where do we stop? and is the extra control worth it? I really don't know, I decided I would not upgrade my system until the summer, if some thing goes wrong, I want time to correct, seems likely I will opt for Wiser. But I look at Hive and think why pay more? But the range goes to £149.99 and one asks the question what more does it do? It is the small print like "Hub required for app use and hot water control (sold separately)" and one thinks hang on, it says "Hubless" and it seems it uses a zigbee hub and I already have one of those. But will it work?

So your not the only one who feels bamboozled by all this technically talk, I have been caught out once with Nest, which seemed the bees knees, and don't want to get it wrong a second time. I have the old TRV head where I intend to fit second wall thermostat, at the moment showing the one which replaced it after the carpet fitters damaged it is showing

so 19.1ºC v 22ºC in same room, it shows a lovely report but how does that help? The TRV shows a better report to the Nest Gen 3 wall thermostat even if 1/5th of the price. It all seems daft.

 

[JonathanM]

namely the party mode

A special mode for parties? How does that work?

 

[TomaszG]

After 12 years of faultless service our old Honeywell CM927 wireless thermostat/controller finally gave out. The display failed and although the trick with bulldog clips and hairdryer worked for a while, even that stopped working eventually.

Without really checking we went along with our plumber's recommended replacement - a Honeywell T4R. Its OK and works fine, but it really does lack some of the handy features we liked on the CM927 - namely the party mode and day-off features. We seem to have downgraded functionality unintentionally. Is there a higher spec Honeywell that does retain these features or are they hidden in the T4R somewhere?

P.S Its controlling a WB combi boiler i.e. heating only, not hot water.

I just installed my T4R yesterday. My CM927 has died during the screen fix operation. It lasted 10 years. RIP CM927. I think that some of the CM927 functions were doubled, like the party mode or day off. On T4R you can achieve the party mode by simply overriding the setpoint in the auto mode and setting the override time (pause symbol, first buttom from the left). Day off - switch the thermostat off for a day or like with party mode, override the setpoint for 23 hours. Perhaps T4R has less function/buttons, but it still has the same functionality, in my opinion of course.

 

[wbmkk]

Funnily enough I too have a CM927 programmer, which works, but of course I can no longer change any settings, as the display is almost blank, even with new batteries.

I've been looking online and the T4R seemed the best choice for my needs, but reading some comments here I'm wondering .. is there a better model ?

It's for a wireless connection to a combi boiler, to control CH only

 

[TomaszG]

IMO T4R is the closest replacement of CM927. The only difference I have notice after almost a month of usage is the current temperature display scale. Instead showing temperature in 0.1 deg C it shows in 0.5 deg C. It was a bit annoying when I noticed first, but now it doesn't bother me that much. You can go with T3R, but to my knowledge it doesn't offer the holiday mode.

 

[wbmkk]

IMO T4R is the closest replacement of CM927. The only difference I have notice after almost a month of usage is the current temperature display scale. Instead showing temperature in 0.1 deg C it shows in 0.5 deg C. It was a bit annoying when I noticed first, but now it doesn't bother me that much. You can go with T3R, but to my knowledge it doesn't offer the holiday mode.

thanks

Will the new TR4 (or TR3) work with he old receiver ?

Does the controller come with a receiver, or can you just buy the controller ?

 

[TomaszG]

thanks

Will the new TR4 (or TR3) work with he old receiver ?

Does the controller come with a receiver, or can you just buy the controller ?

T4R won't work with the old receiver and normally the new receiver should be included with the T4R, but I have seen on eBay some people sell new T4R without the receiver so be careful when buying. I am not sure about binding T3R to old receiver (I am guessing BDR91). According to the Resideo (renamed Honeywell) this is possible. https://support.resideo.com/s/artic...language=en_US#:~:text=In order to bind the,2.

 

[wbmkk]

Just spoken to my gas engineer to arrange a boiler service and the fitting of the new thermostat.

I had mentioned the TR4 but he suggested a Neomitis unit, a brand I had never heard of before. No doubt he knows 500% more than me but just checking it's OK .. i want to be able to programme 7 separate days, say 4 on/offs per day, as a minimum

 

[TomaszG]

Just spoken to my gas engineer to arrange a boiler service and the fitting of the new thermostat.

I had mentioned the TR4 but he suggested a Neomitis unit, a brand I had never heard of before. No doubt he knows 500% more than me but just checking it's OK .. i want to be able to programme 7 separate days, say 4 on/offs per day, as a minimum

I am not an installer and I don't know the brand. I guess you will have to do some research, but if you trust your gas engineer then that won't be necessary.

 

[CountryFan]

I like the Neomitis brand, been going some time, just not as popular as Honeywell, Drayton, Nest, Hive et al. I have started fitting them at work, someone on here said they weren’t the best for aftersales.