Central Heating System question!

[dancemom]

Some time ago i realised the radiator in my daughters bedroom wasnt heating up properly. I got an engineer out and he couldnt find any issue so he thought it was because it was furthest from the boiler. To counteract this he turned down the lockshield valves on the other radiators in the home to help my daughters get more heat.
However I have since discovered the issue is actually with the temperature controller on the radiator in my daughters room, its somehow pressing down on the valve and stopping the water flowing in freely. We took the temperature controller off and the radiator is filling and heating normally.
However i thought i should return the lockshield valves to their original settings on all the other radiators so turned these anti clockwise until they gave resistance. Im now worried I shouldnt have touched them and am panicking im going to wake up with exploded radiators or no heating at all!
Can anyone confirm i have done this correctly?

they won't explode.

As a very rough guide, turn all the lockshields fully off, then open them half a turn each, then turn the boiler back on and run the heating for half an hour. Feel the pipes at each end. One will be the flow and should be "too hot to hold" the other will be the return and should be "too hot to hold for long"

If any are too hot, turn them down by an eighth of a turn and feel them again after another half hour. Most of the adjustment on lockshields is on fractions of a turn when they are nearly closed.

Look for makers name and identifying marks on the faulty TRV and post a photo. With luck they are still available and you can buy a new one and swap the heads. Always screw a TRV head fully upwards before removing or refitting

btw your radiators might also be accumulating dirt and sludge. Feel them all over and see if any are cold in the middle or at the bottom. If you are fond of DIY plumbing you can do a chemical clean at low cost.

Thank you PJ

Within 10 minutes of opening the lock shields fully the whole place was way too hot! I just turned off the hearing completely. Will carry out your instructions tomorrow.