Hi - first post from me. I've recently installed a Honeywell CM Zone system using HR80UK valve controllers. All seems well, with one exception. Several times now I've noticed that a radiator is cold when it should be hot. Even when I turn the knob until "On" is displayed, the valve is not opened. The HR80UK clearly "thinks" that it's already in the open position even though it isn't. At this point I usually remove the HR80UK body and rotate the internal (blue) cog wheel anticlockwise to manually open the valve. I then replace the HR80UK body and then everything seems to work as advertised for a few days. Could anyone offer any advice? How does the valve stroke adaptation work? I've been wondering if I should switch the HR80UKs to "Full" (no adaptation) instead of "Def". BTW the TRV bodies are all new Danfoss RA type, so I'm using the included adapter collar.
Thanks.
Thanks.
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