3 wire - 2 wire Digi thermostat help

Joined
6 Sep 2012
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Location
Oxfordshire
Country
United Kingdom
I have read the wiki but it doesn't seem to work...

this is my old thermostat
IMG_0505.jpg


IMG_0504.jpg

Yellow into 1
Red into 2
Blue into 4

My new thermostat is a Salus ST320

it has 2 terminals (3 counting earth)

it has L (COM) and SL (NO)

I have tried putting yellow to L and Red to SL,
Have tried Red to L and Yellow to SL
Didn't work...
have essentially tried all alternatives but none seem to work....

Am I missing something... I thought I only needed Live and Switch for this to work....
 
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