Turned everything off and it's got luke warm but not hot - I noticed yesterday evening but pretty sure it was going on last week.
Are we talking a 1/4 turn clockwise and just work them until it gets hot?
You could set all the other trvs to 1 and see if it gets hot, otherwise try diables suggestion of manipulating the trv mech with the cap off it, sometimes they're stuck but I think your installation is quite new.
@Airhead started
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Turned everything off and it's got luke warm but not hot - I noticed yesterday evening but pretty sure it was going on last week.
Are we talking a 1/4 turn clockwise and just work them until it gets hot?