Hi, please could someone tell me if this is 'normal' !??
We have a CH system, 9 rads, 8 of which have TRV's...Ive noticed that setting to number FOUR allows the rooms to heat to around 21, (which the wife is happy with!)
However, once temp reached, the TRV's cut in and stop flow....and then dont generally allow water to flow back....until the temperature has dropped considerably (and sometimes only if you 'wiggle' the control now about a bit..)
Ive removed a couple of the sensor heads, and the pins all look fine and aren stuck at all
The sensors are Danfoss, and I believe are still available...they are all around 10 years old, could they just be too old and past their best?
Im not 100% sure how the TRV work to adjust the 'pushes' (is it wax??)
- but what would would be the normal temperature variation to enable them to 'reduce' when the temp drops to allow water to reflow??
Confused of Lincs!
PS, Ive lived with this for a couple of years....and just thought its time to try and fix!