Is it a new install, How does the boiler know when it is up to temperature?
We run it off the internal clock, inefficiently, hence wanting to sort a new thermostat. It's about 3 or 4 years old but never installed along with a thermostat
Ok in that case look at the set up instructions for the boiler, there will be a row of connectors with two being for the thermostat.
@Backstop started
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Is it a new install, How does the boiler know when it is up to temperature?