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thermostat

A thermostat is a regulating device component which senses the temperature of a physical system and performs actions so that the system's temperature is maintained near a desired setpoint.
Thermostats are used in any device or system that heats or cools to a setpoint temperature, examples include building heating, central heating, air conditioners, HVAC systems, water heaters, as well as kitchen equipment including ovens and refrigerators and medical and scientific incubators. In scientific literature, these devices are often broadly classified as thermostatically controlled loads (TCLs). Thermostatically controlled loads comprise roughly 50% of the overall electricity demand in the United States.A thermostat operates as a "closed loop" control device, as it seeks to reduce the error between the desired and measured temperatures. Sometimes a thermostat combines both the sensing and control action elements of a controlled system, such as in an automotive thermostat.
The word thermostat is derived from the Greek words θερμός thermos, "hot" and στατός statos, "standing, stationary".

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  1. E

    Thermostat not reaching the temperature which I have set.

    . . . Honeywell CM927 Thermostat Ethos 54C (Condensing Combination Boiler) I set the Thermostat to 26°C (79°F). The boiler fires up and heats the home to 22.5°C (72.5°F), and then it stops. * The thermostat shows me it is currently 22.5°C, but refuses to continue heating to 26°C. I just...
  2. C

    Vaillant VRC430 in lounge using VR81 as thermostat

    I have a vrc430 which is mounted in one room, near the boiler, but I want my vr81 to be the thermostat that controls the room temperature, and not the thermostat in the vrc430. How do I achieve that ? What setting should I set on the vrc430 between thermostat, modulation, or off .? thanks
  3. M

    Thermostat Not Dropping Quickly Enough

    Hi I live in elderly sheltered property and have nothing but trouble with thermostat. I’m a bit confused. When i put it on 19 degrees intuitively i would say that when it reaches 19 it would turn off the boiler. But it goes to 20 before the boiler switches off. You now have to wait for it to...
  4. C

    Vaillant VRT392f fault thermostat controller

    Our VRT 392F wire thermostat control is not working, it lights up and you can change Deutch to English but then you cannot do anything else. Water leaked into our circuit board on our boiler but we have had a new circuit board put in. I looked at the thermostat control, changed the batteries...
  5. southernlead

    Help with choosing smart thermostat

    Hello, I am trying to identify components in my central heating setup as a precursor to installing a smart thermostat and TRVs (looking at Tado, but open to other suggestions). My issue is I don't really understand what I'm looking at in terms of the components around my boiler and thermostat...
  6. O

    Heating always on and reduced hot water temp

    Hello. I wonder if someone can help. We have noticed 2 issues in our house over the last couple of weeks . We have a Glow Worm Ultracom 24cxi combi boiler and have never had problems with it previously 1) central heating always/near constantly on. We have 2 small radiators and a towel rail...
  7. M

    Wiring up a WR1 wireless thermostat

    Advice on how to Wiring up a WR1 wireless receiver to a Greenstar 25SI boiler Have LR > C on thermostat Ls > L on thermostat Ns > N on thermostat L > L 230 supply N > N 230 supply Receiver turns on call for heat receives green light comes on but boiler does nothing … reading online I’m...
  8. J

    CM927 Thermostat Accuracy

    Hi, First post and I hope its not a stupid question, we have a Baxi 105e combi connected up to a Honeywell CM927 and BRD91 which has been running quite happily for the past 10 years (with the exception of having to heat up the LCD over the toaster every few months as the LCD failed a couple of...
  9. R

    Thermostat problem help please

    Good morning, I wondered if someone could give me some help please. I have had a new boiler fitted and have a center thermostat but nearly every time I go to turn the heating on or off the screen goes blank. On the first one I had I had to completely reset the time date etc now I am onto the...
  10. 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...
  11. spagettilegs

    Help in choosing a geothermal thermostat

    I have a “Theben RAM 797” heating thermostat Which controls a geothermal heating system which needs to be replaced. It’s been there for about 20 years and I would like to use something a bit more modern which I can control remotely. I have had a look online at various thermostats I’m a bit...
  12. D

    Central heating programmer and thermostat issues

    Hi, We moved into our house last year and our current central heating set up is: Boiler: Vokera Mynute HE system boiler Thermostats: 2x Robus RRF10 analogue thermstats (one in hallway and one in master bedroom) Programmer: Anaglogue Flash Immermat Timer Clock. When we came into the house...
  13. H

    How to install a thermostat

    I have a very old thermostat in the hall and a very old programmer in the bedroom next to the hot water tank. I would like to install the Honeywell St9400c thermostat programmer in place of the old thermostat. will this work, as I wish to program everything from the Honeywell thermostat hot...
  14. T

    Hot water too hot, changed element and thermostat

    hot water tank water too hot, i have replaced the thermostat and element but still the same issue. Th element is housed in a 4" section of pipe fed from the base of the tank to to top of the tank. Any help appreciated. Any advice welcome, Tony H
  15. F

    Wireless Thermostat upgrade

    Hi all, I have a potterton promax combi boiler with a very basic Neomitis wireless thermostat. If I upgrade to a programmable Neomitis thermostat what are the chances it will work with the existing receiver - I’ve no idea what receiver it is or where it is but it’s currently working.
  16. A

    Boiler weather comp being controlled with a optimising room stat

    Evening chaps. As the title says, can a boiler with weather comp run with an optimising room stat? I have a Glowworm Flexicom 35cx that can accept an external (outside) sensor, and the main controls is a Honeywell CMT927 optimising room stat. Reason I ask is I think they will fight each other as...
  17. S

    Room thermostat options

    I have a Worcester Greenstar 30i ErP boiler with a British Gas RS2 wired room thermostat. This is what I'd like to achieve I would like, if possible, to change the room thermostat to one that allows two different temperature settings i.e., a lower nighttime setting. Non wireless/smart as the...
  18. T

    EHE0200361 Thermostat Binding Assistance

    Afternoon All, I have a Center EHE0200361 Wireless Transmitter that appears to have lost the binding to the relay box on the wall. I have a flashing red light on the relay box and the TX isn't sending information to the boiler. How do I re-bind this transmitter - I can find instructions for most...
  19. N

    Timer and Thermostat Update

    Hi all, I have a mechanical timer (5 wire not including ground) by the boiler for heating & water and a thermostat in the living room. The timer keeps missing switches so not coming on/off automatically. I could replace it like for like but I'm considering removing it and changing the...
  20. zack6600

    How to replace thermostat cartridge

    Hi Folks, Need your advice on how to access a thermostat cartridge to fix/replace. Please see pics below. I have manged to to get the main shower control cartridge out as it is leaking badly. But now need to sort the thermostat/mixer out now as very stiff and difficult to turn to cold. The...
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