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Honeywell International Inc. is an American publicly traded, multinational conglomerate corporation headquartered in Charlotte, North Carolina. It primarily operates in four areas of business: aerospace, building technologies, performance materials and technologies (PMT), and safety and productivity solutions (SPS).Honeywell is a Fortune 100 company, ranked 94th in 2021. The corporation in 2020 had a global workforce of approximately 103,000 employees, down from 113,000 in 2019. The current chairman and chief executive officer (CEO) is Darius Adamczyk.The corporation's current name, Honeywell International Inc., is a product of the merger of Honeywell Inc. and AlliedSignal in 1999. The corporation headquarters were consolidated with AlliedSignal's headquarters in Morristown, New Jersey; however, the combined company chose the name "Honeywell" because of the considerable brand recognition. Honeywell was a component of the Dow Jones Industrial Average index from 1999 to 2008. Prior to 1999, its corporate predecessors were included dating back to 1925, including early entrants in the computing and thermostat industries.In 2020, Honeywell rejoined the Dow Jones Industrial Average index and the following year moved its stock listing from the New York Stock Exchange to the Nasdaq.

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  1. R

    Glow Worm 30sxi boiler hot water says no...

    I have a Glow Worm Ultracom 30sxi boiler that provides central heating and also heats a hot water tank. There are no error codes shown on the boiler but recently the hot water has stopped working. If I try and change the temperature under the tap symbol, it just displays 'no'. The boiler is...
  2. R

    EvoHome Heating off still heats some rooms

    Hi, For EvoHome users/installers out there. Is it normal that when I select from Quick Actions - Heating off, the radiators will still get hot as set on individual Radiators valves (HR-92s). Every time I select heating off (to switch whole heating system off) I can see that some radiators are...
  3. X

    Honeywell T6 wired back plate

    Hi. I'm looking for a wiring wall mount plate/ back plate for the Honeywell T6(wired version). Does anyone have one by any chance that is willing to give away or sell? Don't really want to by a whole new system just for the backplate. Thanks
  4. R

    Swapping a Danfoss valve for a Honeywell

    Kingo. Did you resolve your 3 port valveswop re wiring.
  5. T

    Replace 2-wire Honeywell CM707 zone stat

    Hello. I have a two-zone heating set up, with each zone controlled by a 2-port zone valve (Honeywell V4043H by the looks of it), and each zone has a two-wire HoneywellCM707. I would like to replace the CM707 in the master bedroom (for a mechanical stat that doesn;t click). In terms of...
    • Tractorman
    • Thread
    • forum honeywell plumbing replace zone
    • Replies: 2
    • Forum: Plumbing Zone
  6. J

    Honeywell Evohome HR92 valve control stopped working

    I have a Honeywell Evohome system that is in general working well but one of the HR92 radiator valves has suddenly stopped working just before Christmas The valve appears to be communicating with the controller but the valve was stuck open. It appears to be communicating with the controller but...
    • jcs8215248
    • Thread
    • america control evohome honeywell stopped usa valve working
    • Replies: 3
    • Forum: USA
  7. E

    How long do honeywell two port motorised valves last?

    Ours are lasting between a year and two years and then I have to replace. Is this normal or should I be investigating our central heating system to find out why? Which motorised valves do you recommend I use?
    • Ed_R
    • Thread
    • america honeywell motorised motorised valves usa valves
    • Replies: 11
    • Forum: USA
  8. R

    honeywell ST9400c controller Timer query

    Hi I recently got this programmer installed during my new boiler (Worchester) installation. I am still getting use to it, however my query is I have very odd programmed times currently set. My 3rd timer slot is set 12pm-2.50am, yes we have our boiler heat the radiators while we go to bed and...
  9. O

    Honeywell T4R wireless range to boiler relay

    Hi all, we have a house with solid stone walls with a combi boiler serving it from a block built outbuilding next door. Currently there's a Siemens RDJ10 thermostat in the hall which is not much good as the temperature is very different in the open plan kitchen diner. I was thinking of...
    • Ollie R
    • Thread
    • boiler honeywell range relay wireless
    • Replies: 2
    • Forum: Central Heating Forum
  10. N

    Honeywell ST699 switching fault

    Honetwell St699, will switch on in once mode at desired time but won't switch off at desired time will just continue, any ideas would help greatly
    • Nobby1924
    • Thread
    • america fault honeywell st699 switching usa
    • Replies: 6
    • Forum: USA
  11. J

    Viessman vs Vaillant and Honeywell vs Tado vs Hive

    I am trying to help my dad decide with a boiler replacement, can't decide between Vaillant Ecotec Pro 30kw or Viessmann Vitodens 100 30kw. The boiler will be going in the exact same spot as before. Both will have a system cleanse, inhibitor and magnetic filter (I am not sure which brand or...
    • Justice League
    • Thread
    • america hive honeywell tado usa vaillant viessman
    • Replies: 4
    • Forum: USA
  12. DJseals

    Upstairs rads only warm

    My rads upstairs in bedrooms today only getting warm. The bathroom and ensuite are not used but when trouble shooting today they got red hot when on. Downstairs rads all get hot very quickly, and hot water works. But rooms only warm. 1 bedroom was cold. I understand balancing a system, but that...
    • DJseals
    • Thread
    • america central heating system cold radiator honeywell hot rads radiators upstairs usa warm
    • Replies: 19
    • Forum: USA
  13. T

    Honeywell normally open zone valve

    Interesting question and one I’ve never even thought about until I messed up today. This might be a bit long…. I’ve got a multi fuel system on the go, gravity primary’s for hot water off Rayburn, big biomass boiler, air source is involved for the floors , pumped heating split into 5 zones blah...
  14. M

    honeywell evohome to replace a cm 927

    our combi boiler has been controlled by a honeywell cm927 wireless thermostat. it has now packed up, and i was looking at getting the hive or nest, however i have now seen honeywell do the evohome, if i went this option would i need to wire in a new controller at the boiler? or would evohome...
  15. R

    Need help understanding Honeywell T4 thermostat optimisation

    I've tried to email Honeywell, but their web address is playing up and they aren't receiving. Unfortunately Honeywell is extremely poor at providing explanations even when I found the firm's online explanatory PDF that tried to explain what Honeywell means. Anyone had an answer that answers...
    • Ric2013
    • Thread
    • america help honeywell thermostat usa
    • Replies: 11
    • Forum: USA
  16. F

    Honeywell 2 port zone valve not turning on

    There's power going to the valve head but the motor won't activate to turn the spindle to open the valve. The manual override will not activate the valve either. Should I replace the valve powered or Whole valve unit with pipe/spindle attached. My initial thinking the valve motor died and I...
    • Fieldbird
    • Thread
    • 2 port america forum honeywell plumbing turning usa valve zone zone valve
    • Replies: 8
    • Forum: Plumbing Zone
  17. P

    Honeywell ST9100C set to 'off' but boiler still provides domestic hot water.

    Hello folks - first post here. Last week our faulty Honeywell ST6100C programmer was replaced by a ST9100C, this being the Honeywell-recommended replacement. Our regular heating engineer did the swap because the backplate was stuffed, so a simple DIY clip-on swap wasn't possible (by me at least...
  18. A

    URGENT No LED display on honeywell cm921 batteries all replaced & Checked. Ant thoughts pls

    No LED information on a Honeywell cm921. Batteries all changed & checked, any ideas pls. Can they be repaired or is it a new one required
  19. J

    Honeywell CM927 replacement

    I have a Vaillant eco plus 630, with hot water controlled by a Honeywell ST9100C and heating controlled by a Honeywell CM927installed around 8 years ago. The display is going on the CM927 (seems to be a common problem) so I am planning to get it replaced with the newer version Honeywell T4R and...
  20. W

    Honeywell ST9400C wired correctly?

    Honeywell ST9400C – is there any set up where the hot water slider would control both hot water and central heating? That’s the simple question, the rest of the info is: Mother in laws house. Large 4 bed detached house only 12yrs old. Radiators upstairs, underfloor heating downstairs controlled...
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