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Thread: New Room Thermostat problem

  1. #1
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    Default New Room Thermostat problem

    I've recently tried to install a Sunvic TLX 7501 room thermostat and although this seemed simple enough - it is not switching on the heating. The unit 'clicks' when a temerature above the ambient temp is selected, but the boilier doesn't respond. Previously, I had a manual type Sunvic thermostat which would only turn on the heating when the temperature was turned down rather than up. THere are only two wires - red and black and a yellow/green earth - so I can't see what the problem is - unless I need a different type of thermostat? The old one that preceeded the SUnvics was an old brown and silver Honneywell unit. Any ideas?

  2. #2
    Moderator sunbeam's Avatar
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    Default Re: New Room Thermostat problem

    does the small flame appear in the window of the stat when you are calling for heat?

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    Default Re: New Room Thermostat problem

    No flame - I'm pretty sure that the Boiler is not receiving anything from the switch.

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    Moderator sunbeam's Avatar
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    Default Re: New Room Thermostat problem

    if there's no flame i'm guessing it's the stat,

    there's a small tag between the batteries and the battery connections have you taken this out ?

    i'll have a look for some instructions for the stat ,but i'm shure you have to cut a link in the back of the stat.

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    Default Re: New Room Thermostat problem

    Tag is out.

  6. #6
    Moderator sunbeam's Avatar
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    Default Re: New Room Thermostat problem

    the flame on the stat only shows that the stat is calling for heat,

    the stat doesn't need to be connected to anything.

    so i reckon the stat isn't calling for heat,

    are you connected to terminals 2 and 3

  7. #7
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    Default Re: New Room Thermostat problem

    yes - brown in 2, blue in 3

  8. #8
    Moderator sunbeam's Avatar
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    Default Re: New Room Thermostat problem

    mmmmm dunno

    the instructions are here,

    http://www.sunvic.co.uk/TLX%20Digita...501_user_w.pdf

    i think i'd take out and re-place the batteries then press and hold any key for 5 secs ?

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