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Honeywell CMT907A1041 7-Day Programmable Hard Wired Room Stat

4.2 out of 5 stars 105 customer reviews
| 29 answered questions

RRP: £101.43
Price: £71.24 & FREE Delivery in the UK. Details
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13 new from £68.27 1 used from £63.65
  • 7 Day Heating Programme
  • Dynamic text display
  • Surface or wall mount options
  • Attractive Ultra modern slim design
  • Auto Summer/Winter time change

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Frequently Bought Together

  • Honeywell CMT907A1041 7-Day Programmable Hard Wired Room Stat
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Total price: £152.82
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Product Information

Technical Details
Part Number CMT907A1041
Product Dimensions15.6 x 11.4 x 5.2 cm
Batteries:2 AA batteries required. (included)
Item model numberCMT907A1041
FinishMultiple
MaterialPlastic
Power SourceBattery-powered
Voltage24
Item Package Quantity1
Number Of Pieces1
UsageIndoor use only
Batteries Included?Yes
Batteries Required?Yes
Battery Cell TypeAlkaline
  
Additional Information
ASINB003DTROQ8
Best Sellers Rank 31,254 in DIY & Tools (See top 100)
Shipping Weight299 g
Delivery Destinations:Visit the Delivery Destinations Help page to see where this item can be delivered.
Date First Available24 Mar. 2010
  
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Product Description

Product Description

The CMT907 is a 7 day Programmable Room Thermostat. It is designed to provide automatic time and temperature control of domestic heating or cooling systems in domestic or light commercial premises. The slim, ultra modern design complements the extra large LCD screen with the Line of Text (Lot) display and function buttons to ensure simplified programming and operation for all users.

Box Contains

1 x CMT907A1041 Programmer



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Customer Questions & Answers

Customer Reviews

Top Customer Reviews

By Gee-Whiz TOP 50 REVIEWER on 6 Dec. 2012
There have been a few comments regarding the cycling function of this controller - in so much that by default the controller has 6 heat cycles (6 x on/off) per hour. But what hasn't been pointed out yet is that the cycling only kicks in when the temperature is within 1.5°C of the desired temperature. (This is adjustable between 1.5-3.0°C in the installer menu.) So if you set the desired temperature to be say 22°C then the controller will be permanently on until the room temperature reaches 20.5°C at which point it will start cycling to reach the 22°C setting. The cycling is designed to optimise condensing combi-boiler efficiency and ensure that the set temperature is reached controllably and not exceeded. The default setting is 6 cycles per hour as is what is recommended for combi-boilers but you can adjust the number of cycles from 3-12 if you like. Of course if you're finding that the cycling is not allowing the heating to quite reach the preset temperature (in very cold temperatures) you can always set the temperature 1.5°C higher than the desired temperature to compensate and it'll not cycle. You can then add another program to set the temperature at your actual desired temperature and the cycling will be able to maintain it. For example: if I want the temperature to be 21°C by 8am I may set the heating to come on at 7am and set the temperature to 22.5°C. I may then set a program to change the temperature to 21°C at 8am and the controller will accurately maintain it. Once you learn how the cycling works you can exploit it as described and end up with a very accurately controlled heating system.

I also like that you can calibrate the room temperature - so if the temperature reading on the controller is a little off, you can adjust it to get it spot-on rather than setting the temperature higher/lower to compensate. Would buy again and recommend. Bought from a local plumbers merchant for £60.25.
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We used to have a Drayton Digistat 3, which was quite old and started to switch itself off leaving the boiler in its last state, i.e. on or off. I also found the Drayton incredibly complicated to configure over 7 days and I normally quite good with these sort of things.

The Honeywell CM907 is brilliant and much easier to use than the Drayton! I love the fact I can not set the room temp down to .5 of a deg, where as with my old thermostat I found 21 a little too cold and 22 a little too warm. I also love the "Day off" feature, so you set all your times up for the weekdays and weekends and if you are off during the week, you press the day off button and it runs Sunday's program, so you have a warm house all day. Also I like the party feature, so if you have friends over for dinner and run late past the heatings programmed time, you can press this button to make the heating run and extra hour, or set how long you want it to run, after which it returns to its normal times.

It is covered in easy to use buttons so you don't have to click through tireless menus to find what you want, one or two clicks and it is doing what you want it to do. It is packed with all sorts of features that will make your life easier.

Really easy to install, took me 20 minutes! Mine was connected to a Combi Boiler so all you have is two wires to hook up.

I highly recommend this product to anyone out there who either wants to update their existing programmable thermostat or wants to replace their thermostat with a programmable one.
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I read the other reviews and can confirm that the LCD gives up the ghost after 3-4 years. It randomly comes back for days or weeks at a time and randomly disappears again (nothing to do with the battery.) It is still functional during this time but you cannot read the display as several bars will be missing. For the high price of such a simple product this is simply not acceptible. We also had the "+" button never really work/react well from day one. Core functionality is very good though.
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The biggest problem with this is that you have to treat it as a consumable as the display only has a life of about three to four years before so many segments have failed that it is impossible to set the time properly, or re-program it. This is based on a 100% of a sample of two, bought three to four years apart! The first one continued to degrade in storage and only had about three segments left when I powered it up.

From what I've found, from some research, the most likely problem is the heat bonded connector on the ribbon cable between the display controller daughter board and the display panel itself. Someone on the Instructables web site claims to have successfully repaired this, but the method is probably not for the faint hearted and can probably only be applied once.

As a consumable, it is pretty expensive, especially given what it is: an Atmel (as used in Arduino) microcontroller, a display and a latching relay, with a few support chips and, presumably, a thermistor. One can buy Android devices for less.

The other significant problem is that the clock keeps very poor time and there is no provision to trim it (at least not one that is officially documented - maybe some of the undocumented jumpers, or unpopulated solder pads allow this). This means you need the display to work, to reset the time, even if you never change the program.

I've also had it latch up on a couple of occasions, on one occasion with the boiler turned on after the Summery mid-day pump exercise (optional). I think it may have been in very dry conditions.

Having said all that, it seems to work well as a time dependent thermostat, and does keep very tight control of the room temperature; the temperature calibration is much better than the clock frequency.

Unfortunately, I'm also dependent on the matching remote sensor (read thermistor in a box), so I may end up throwing good money after bad and replacing it yet again..
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