Boiler not firing up

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So got my new thermostat and extension kit today and all has been installed (old thermostat was wireless and kept existing backplate/wiring from old receiver for the extension kit)

Everything is connected but the boiler isnt firing up when i increase the temperature.

Any ideas?

Thanks!

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  • LaurenB87
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    Old thermostat is a drayton digistat +3 rf

    Combi boiler and as far as i'm aware its pumped. Hot water works ok just the heating side of it