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I have a zone which comprises two rads, each with an HR92, and a YR87... (can never remember the name but it's the round, digital stat). The YR-blah controls temp and the HR92s are dumb actuators.

How do I temporarily (ie until our Xmas tree is no longer next to the rad) disable one HR92?
If I turn the HR92 in question to OFF it sets the zone to OFF (5 degrees). If I then override the temp, via the YR-blah or Evo controller, it all works fine but at the next set point the whole zone flips to 5 degrees.

For now I have removed the HR92 and removed batteries but the controller is complaining of a comms fault. Not the end of the world but was hoping there was a way to do this without unbinding or removing the HR92

Just take the head off the radiator HR92 and wind down the wheel to shut off the rad. Leave the batteries in to maintain comms.
When you've done with the tree, just wind out the wheel and put the head back.
Mean time the Y87 will continue to control the other rad.

Yeah. I guess so