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Which type of unit have you got, Daikin or Cosy 6?
If it’s configured to run in pure weather compensation mode (which it ought to be), then there is no concept of a ‘thermostat’, the heat pump modulates itself according to the outdoor sensor and the weather compensation curve set in the controller.
If you’re not reaching your desired indoor temperature, then you’ll need to adjust the weather compensation curve in the controller.
But yes, call Octopus, it’s their job to do all of this for you.
New to this thread. Just had an air source heat pump fitted by Octopus. Doesn't appear to be working entirely correctly as the hall thermostat temp isn't triggering a kick in for heating. Top heating temp registered so far is 19c. Hot water temp seems ok. I really don't understand how this shit works and please no-one say it's a fridge in reverse as I have that in bold letters on my heat pump bingo card.