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Fault Finding Guide
If the temperature is not changing e.g.
Then this is most likely caused by a TRV on the radiator in the same room as the Thermostat. Please see this guide on why and how to remove this.
Other causes include:
Radiators not getting hot enough (go back and select radiator issues)
Boiler Flow Rate
Boiler Water Temperature too low
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What problem are you facing?
The temperature doesn't change