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honeywell

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  1. P

    Replace ancient Honeywell mechanical thermostat with a Honeywell T3R

    I would like to replace my ancient Honeywell mechanical thermostat with a Honeywell T3R PROGRAMMABLE THERMOSTAT I have three wires in the old thermostat. Please see the first three photos. 1 Red 3 Yellow 2 Blue are these 1 Live 3 Live return (Switched) 2 Neutral Could I configure it as in...
  2. H

    Honeywell TRV low temperature

    Hi. I have all the rads in the house controlled with wireless Honeywell TRVs. This was done by an installer about 2 yrs ago. The kitchen TRVs are not working properly. The app says the kitchen is only 5 degrees as per the TRV, but the room is definitely warm and as a result, the rads seem to be...
  3. JamieP83

    Honeywell Evohome Viessmann Vitodens 222-F -- help

    hey all, Based in South England, UK. Hope this is the correct place to ask and that ive added all the required info/images. I had an old boiler that was setup with my evohome system, 12 zones in my house, with controls on each radiator - all worked well. Honeywell THR99C3112 Evotouch...
  4. H

    Can I replace Honeywell cm921 with a cm61

    My old wireless thermostat cm921 is losing part of the screen could anyone tell me if a cm 61 would be a direct replacement and I would just need to bind it to my existing receiver. I know it’s an old thermostat but it’s working and it’s free. Thanks
  5. Ronjazzer

    Honeywell ST 699 Programmer Unit malfunction

    I have an ST699 control unit on my central heating system (some 15 years old) which has developed a strange fault. After running normally, when the required room temperature is reached it cuts out as usual but immediately loses electrical power, with both the time display and the red lights...
  6. P

    Honeywell evohome BDR91 problem

    Hello, I have just installed the Evohome system hot water kit . I now have 2 x BDR91 relays. One is commented to the electric supple to the gas boiler and the other controls the hot water valve. I have 8 x HR92's all connected and communicating fine with the Evotouch Controller. However I...
  7. M

    Honeywell ST6400C clicking and flashing

    Honeywell ST6400C Hi, my Honeywell timer is flashing and clicking when both water and heating switched to auto or on together. And nothing works. Works if one or the other on. Believe 3 port on way out, makes a racket changing over. I’ve ordered one and changing over tomorrow. Just want to...
  8. N

    honeywell y6630d1007 alternative

    Hello looking for a replacement for honeywell y6630d1007. Ideally something that can be controlled by smart phone. Any recommendations
  9. L

    Honeywell timer wireless

    hello I have a Worcester greenstar 18Ri with a Honeywell st6400c timer next to the boiler and a dial thermostat down stairs. it is a system boiler not a combi and has a separate hot water tank. I'm looking to find out if I can replace my Honeywell timer st6400c for a Honeywell sundial RF2 pack 3...
  10. G

    Honeywell TR4 and BDR91T1004

    Hey, Got what I believe is a BDR91T1004 receiver, image attached, working with a CM927. Have the same problem with the screen going on the controller that a lot of people have raised and so need to replace it. Do you know if it is a BDR91T1004 receiver? Can you buy a TR4 and pair it a...
  11. C

    Replacing Honeywell CM921

    Hi, I need to replace our Honeywell CM921 wireless thermostat. The screen has been failing for the last few years, it's about 13yrs old. I tried removing the screen and heating it over a toaster ala Youtube video I saw but it didn't help :) I'm looking at some second hand/nearly new ones on...
  12. J

    Honeywell programmer internal battery?

    Hi all, My customer has a Honeywell Home ST9500C two-zone programmer. One of these: Honeywell ST9500C 7 Day Two Zone Programmer | Programmers & Time Switches -...
  13. J

    Honeywell programmer / wireless thermostat problem

    So I've used a wireless thermostat to activate my heating since installation, but it's just stopped working (Blank screen, no new battery's fixed fixed it) The wall mounted programmer screen flash's no signal, like it's searching for the wireless thermostat, I cannot turn the heating on at all...
  14. A

    Looking to replace Honeywell Diverter Valve on pressurised system

    Hi The area is near Telford in Shropshire. I have a 25 year old system. A gas fired Rayburn heats hot water and CH. The Honeywell diverter valve (the silver box thingy) has failed on the CH side, but I still have hot water. I bought a replacement, the Honeywell bit, connected to the 3 way...
  15. M

    Honeywell ST9400C - Have to put HW & CH on to get hot water

    May parents have a Honeywell ST9400C, when they want to heat up the emersion heater they have to switch the HW & CH on to get hot water. With the CH on as the same time the house gets very hot, just to have a shower! CAn any one advise what can be wrong?
  16. M

    Which bits of Honeywell heating controls are 24v?

    Hi, I'm super-confused.My new ST9400C controller, V4043H zone valves and T6360B1028 room thermostat were purchased as 24v items (eg see ). But the ST9400C wiring diagram, for example, clearly shows that it needs to be wired to a 240v main supply and nothing in the instructions for either this...
  17. N

    Honeywell BS864-2 22mm possible to replace head without draining?

    I may have a faulty motorised valve head on a Honeywell BS864-2 22mm is it possible just to replace the head or must it be the whole fitment? Do you need to drain the tank to fit a new head on the valve? Thanks
  18. J

    Honeywell DT90 Wired

    How is the above (wired type) installed in a normal? S plan where the room stat(s) are fed from the programmer so a switched live, does the Honeywell have batteries as I think I've read that it needs a permanent live. Two wire stat presently installed.
  19. M

    Honeywell Evohome - BDR91 issue

    Hello, I have just installed the Evohome Value Pack A which has 2 x BDR91 relays. One is commented to the electric supple to the oil boiler and the other controls the hot water valve. I have 8 x HR92's all connected and communicating fine with the Evotouch Controller. However I and having...
  20. J

    Replacing a Honeywell T40 thermostat with a Honeywell DT90e

    Hi I'm replacing my old dial thermostat with a digital The wires going in from left to right are Earth Blue 2x Black Brown When electrically tested none are live with thermostat off Research on this and other sites suggest 2x Black into B Brown into A Tie off and isolate Green/Yellow and Blue...
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