The newer Tower head on same valve starts to pass at 3 and not fully open until 4, which is not surprising as the old mechanical heads don't motor full range of pin and self adjust like the electronic type. It is smaller than the previous one and fits into a small space and we are able to regulate heat efficiently. With cheaper TRV heads it only shows the target, so you need a thermometer to get current, I have found thermometers can give up to 10°C different readings depending on where placed in the room, in my living room at this time, windowsill above radiators shows 18.

TRV4 Classic | Drayton Controls TRV4 Classic | Drayton Controls

Here you will find guidance on how to make your home more comfortable and energy efficient using heating controls. These locations include / but are not restricted to UK Highlands and Islands, UK Non Mainland, Isle of Wight and Northern Ireland. I have a draw full of new tower TFC group heads which will likely never be used, not a clue what temperature 3. of them have been broken for a couple of years but are in rooms where I don't need to adjust the temperature. This normally meant that the first couple of rads on the system closest to the boiler would have the temp set low (but actually the rads were still plenty hot enough) and the rads furthest away from the boiler would have their temp set higher.Some of our partners may process your data as a part of their legitimate business interest without asking for consent. Only when they are manually turned up (4-max) does the radiator heat up, but then they shut off and never kick back in even though room needs more heat.

Drayton TRV4 problems | Screwfix Community Forum Drayton TRV4 problems | Screwfix Community Forum

This is because there is a very small spring inside the valve which pushes up on the pin and this spring can often get rusty or caked in muck. I had the same problem, what I did was compare target to current once the system has been running for some time, if target is below current then close the lock shield a little, and if target is above current then open the lock shield a little. Remove all the plastic pieces from around the valve top, brush it all clean and then give it a spray of WD40 or - ideally - silicone spray if you have it. It depends on a number of factors including the boiler type as a condensing boiler works best with a bigger difference. I also remembered I dislike them because the body only allows the pipe and 15mm tail to go into it a very short distance, which means no adjustment possible to suit pipes and not compatible with straight swaps with other brands bodies to original nuts and olives.If you've got a Marcus easy-access savings account or cash ISA, you can easily boost your interest rate to 4. in fact at design temperatures an 11 degree drop would be almost impossible to achieve without a massive pump. I am honestly not sure if worth the extra money for expensive electronic TRV heads, because there are some features of the cheap heads like window open detect and warning if pin is either not opening fully or not closing fully which are not on the more expensive model, also being able to set eco and comfort so just press one button on starting to use room, well two buttons one to turn to comfort other to work boost 80% open on valve. Our new Auto-balancing TRVs are a must for every installation and, once set,ensure a permanently balanced system which saves energy and improves boiler efficiency. A Drayton TRV4 radiator valve where the head part you turn to change the temp including the tubular pin has come away from the rest of the unit.