Cannot turn towel rail off

[S coleman]

I have a heated towel rail in both the upstairs and the downstairs bathroom. The one upstairs is super hot all of the time. I bought the house a year ago and I knew this radiator was plumbed into the hot water but I only have the hot water coming on in the mornings but this towel rail stays really hot all the time. The 2 knobs on the bottom seem to just spin when I turn them without actually opening or closing a valve. I took one of them off and there is a nut I can get a wrench on but cannot budge and then a little knob below it that has a screw on the bottom but again, when I screw it’s anti clockwise nothing happens. Any help would be great appreciated.

 

[Deleted member 120897]

Can you post a photo of said valves? I’m not sure why it would stay hout all the time. I doubt it’ll be plumbed into the hot water, more likely broken the 3 tee rule https://ensupport.getconnected.hone...anation-of-Reverse-Circulation?language=en_US