New Room Thermostat problem

[Smeggy]

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?

[sunbeam]

Re: New Room Thermostat problem

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

[Smeggy]

Re: New Room Thermostat problem

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

[sunbeam]

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.

[Smeggy]

Re: New Room Thermostat problem

Tag is out.

[sunbeam]

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

[Smeggy]

Re: New Room Thermostat problem

yes - brown in 2, blue in 3

[sunbeam]

Re: New Room Thermostat problem

mmmmm dunno

the instructions are here,

http://www.sunvic.co.uk/TLX%20Digital%20Room%20Thermostat/TLX7501_user_w.pdf

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