1. P

    Honeywell Zone valve banging on closing

    Honeywell 4043H1056 just installed to replace ESi which was leaking. HW is banging on closing whereas ESi didn't!! Both are power opening, spring closing. HW was installed in the same direction in the return pipework. Arrow points towards the tank. Is that correct? Need another to replace my 2nd...
  2. T

    honeywell thermostat model cm927 issue with low target temperature

    just turned on my heating for the first time since last winter. the thermostat will not allow me to set a target temp above 9.5 degrees. it just cycles back to!
  3. Z

    Honeywell bypass valve possibly not well

    After x number of years, I looked at this valve as the water was very hot very quickly through the valves. It was set to the white band which didn't look correct. I unscrewed the screw to reset it. It fell out and revealed three loose parts Screw, red cover, and black part with the numbers...
  4. J

    Faulty new Honeywell valve?

    Hi guys just exploring a possibility I’ve replaced a 3 port valve and it’s passing into the heating circuit when hot water is on. Could an electrical fault cause this problem? There is no call for heat on the heating circuit, proved with my multimeter. The heating pipe work next to the valve...
  5. M

    Honeywell ST699 Programmer Problem

    I have a System boiler with a programmable room stat and a still very common Honeywell ST699 basic programmer - ten years old. I know that this crosses over into an ‘electrical’ issue but would appreciate if anyone could tell me if anyone has seen this fault and if it shows shows it is faulty...
  6. S

    Help!! Honeywell CM67 Thermostat

    Hi All Have a Honeywell CM67 Thermostat and Centaurplus C27. Trying to turn the heating back on after summer and it's not working. The Honeywell seems to be working. I increase the temperature on manual mode for example and the little flame appears but the heating does not come on. Hot water...
  7. L

    Replacing Honeywell thermostat with nest?

    Hi all, just after some advice I’m looking to replace my current thermostat with a nest system. It states that’s it’s compatible however wanted to check before purchasing and installing. My thermostat has 3 wires as shown in picture. Any help would be appreciated. Thanks
  8. A

    Honeywell stat advice

    Can someone recommend me a simple to use remote thermostat? Preferably a Honeywell. Thanks in advance
  9. B

    Honeywell V4043H Weird Problem

    I wonder if anyone can help with this... One radiator circuit is constantly hot even though the room stats are not calling for heat. So the rad circuit is being fed with hot wat er from the manifold if (for example) the hot water cylinder is calling for heat. I suspected a stuck valve so I...
  10. D

    Honeywell ABV setting

    I have an open-vent S-Plan CH system (22 radiators, 2 DHW cylinders and long pipe-runs) driven from a new 35KW Viessmann 100W WB1B boiler. When most TRVs were open, the Grundfos UPS2 15-50/60 pump was struggling to keep an adequate flow through the boiler (the latter modulated and cycled...
  11. J

    Honeywell 3 port diverter snag?

    G'Day fellers. Appreciate your help please: When my boiler fires up it heats the water and radiators regardless of what is selected. I'm guessing that this means the valve is not moving from the de-energised position? Its a Honeywell V4073A. The manual/auto lever moves freely both ways and...
  12. AskFrank

    No lights on Honeywell HCW80 relay unit

    Hi, My Honeywell HCW80 relay unit is not lighting up at all when I press or hold the button. I believe this fault is causing my central heating to have stopped. Looking behind the cover, things look fine, but I'm no expert. What would be the best course of action here? Picture of the relay unit...
  13. S

    Is this a good partnership Honeywell Evo Home and Intergas

    Hi All I have a Honeywell Evo home in my house. It's connected to an 11 year old Potterton Gold HE28 system boiler and unvented Cylinder. The house is a solid brick house with a rear extension and loft . 5 bed , 4 bathrooms around 3000 square feet. The rooms retain heat at different rates...
  14. C

    Honeywell DT92E Wireless "thermostat"

    I live with my grandmother who had a new boiler installed, some years ago, on the government scheme. We were "lucky" enough to have one of these stats installed in the hallway (which I think is a silly place), and I have found it quite erratic at times. It is usually OK when the weather is...
  15. T

    Honeywell H/W tank thermostat

    Hi, I have a standard Honeywell thermo unit strapped to the side of the tank. It was playing up, good water temp for a few days, hot but you could wash hands under it, just.. to the 5th day where it would be hotter than a kettle, scalding temp. I replaced the unit, took mins, now does the same...
  16. C

    Problem with Honeywell thermostat DTS92E1020

    No heating is coming on at all over the last few days, so have a really grumpy, cold family - hopefully someone here can help! I've checked the boiler and that seems to be working okay. No issues with hot water. When I look at the thermostat it says 18.5, but when I click either the downward...
  17. H

    Honeywell 4073 issues

    Hi Guys, I'm a complete novice trying to figure out a problem with my central heating/hot water. Problem is that I'm getting HW when the programmer is set to CH ONLY. HW ONLY seems to be just fine (complete opposite of what most folk seem to have a problem with.) I've got what looks to be a Y...
  18. S

    Honeywell Wireless issues

    Hello, We had a new boiler system installed last year, including a new programmer and wireless thermostat. These are a Honeywell wireless enabled programmer (ST9420C) & Wireless room thermostat (DT92E) as far as I know (The stat is correct, I think that's the correct programmer). The stat...
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