House Tech wireless TRV system ?

Might just be that your TRV heads are worn out. You could try renewing one of the heads, to see.

Have you actually measured the room temperatures before the kids start playing and after they've been doing so for a while? Are the rads in that room shutting down? It's just that the body isn't a good judge of absolute temperature - it depends on lots of factors which a thermostat can't take into consideration.

If the TRVs aren't maintaining the temp you want have you tried changing the orientation from vertical to horizontal, say?

In message , "Dave Plowman (News)" writes

Or checked that they work at all? The valves can stick, though IME they tend to stick closed.

I've generally found that TRV's to work pretty well, but they won't stop a room getting hot from otherways.

And I assuem the TRV's are turned down ? I'd turn the trv right off and see how it goes.

Indeed. Hence my point at actually measuring the temperature of the room empty and then after it's been in use some time, and making sure the rad has shut down. A radiator can only heat the room - not cool it. ;-)

========================================== Some makers ('Optima' and possibly Wickes) state, "... the head and body must not be separated, they are a calibrated pair and must be used with each other."

If a new head is fitted it might give misleading results, although it's difficult to see why calibration should be so important in this case.

Cic.

He said his are Drayton. They seem to be very good about supplying new heads for valves they stopped supplying years ago.

Calibrated to what, I wonder? Since all the ones I've seen don't have actual temperatures on them. Apart from the anti-freezing setting, I suppose.

========================================= The Optima version has numbered settings 1 - 6 with intermediate marks between the numbers and the manual gives a range of actual temperatures for each major marking. The manual is also quite emphatic about the calibration - "... the head and body MUST be used in conjunction with each other." It seems rather bad marketing to make head replacement impossible in the event of failure unless they offer a re-calibration service with a replacement head.

The Wickes version appears to be their own brand version of the Optima judging by the installation guide.

Cic.