- Joined
- 12 Feb 2017
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One of my Drayton TRV has stuck in the off position, I can turn the TRV head from frost to max but the radiator just won't get warm, I've bleed it and get water out so i know its not air locked. The next 2 radiators on that pipe run are both getting hot as is the pipe work directly by the tee offs to this rad. I've removed the TRV head and the pin goes up and down freely. Could the TRV have failed internally? I'm doubtful its got crap in the system as it was completely replaced only 4 years ago and has had Fernox inhibitor and a magnet filter fitted, flushed and cleaned yearly and Fernox checked and redosed. Water in the system is nice and clean if I've ever do work on it like remove rads etc.