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Thread: Dodgy Thermostat?

  1. #1
    Automated Home Lurker
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    Default Dodgy Thermostat?

    I have recently moved into a 2 year old house. The boiler is controlled by an electronic timer programmer and there is a thermostat controller in the hallway. We leave the electronic programmer for the Central Heating "On" at all times and leave it to the thermostat to control when the boiler actually fires up to heat the radiators.

    Our rooms are either freezing because the radiators don't come on or only for a short time or very occassionally the rooms are hot and the radiators scalding hot. Most times the hallway is chilly (certainly less that the low 20'sC that the thermostat is set at and need to turn the thermostat up to around 23 or 25C before the boiler gets signal to fire up. Sometimes you can turn the thermostat up as high as it goes (30C) and hear it clicking on but the boiler is not getting fired up. Other times with the radiators and rooms are piping hot when only set as low as 20C.

    How can I check if this is a thermostat problem or possibly electronic programmer? We don't have any problems with the Hot Water.

    Appreciate any advice given

  2. #2
    Automated Home Sr Member NeilUK's Avatar
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    Jul 2005
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    Bearing in mind that it will be switching 230v so make sure you isolate the power to the stat before tryinf the following & assuming you have some basic electrical knowledge then if you open up the thermostat you can link out the feed to from the stat and check that the boiler fires straight away. If it does then it sounds like the stat could be at fault. It also sounds like it is in a pretty poor position in any case. If the stat is faulty then why not look for a new RF stat/programmer such as the Honeywell CM67RF wireless room stat/programmer (recently replaced by the CMT927) & HC60NG wireless boiler relay. Works very well, can be left free-standing in a room rather than having to be wall mounted, is easy to use but has some very useful features not found on conventional programmers & stats.

  3. #3
    Automated Home Lurker
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    Thanks .. before taking off the cover, will it be obvious which wires I need to join?

  4. #4
    Automated Home Sr Member NeilUK's Avatar
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    Maybe, maybe not - there is sometimes a wiring diagram within the unit and you might also be able to google for the stat installation/wiring details if you can find the make/model number for it.

    If it is a modern stat then it is likely to have a live feed in, switched lived out and possibly an earth. Many no longer have neutral connections.

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