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Last night we set all the TRVs to max temp. This morning all the air noise was in just one upstairs rad instead of all three. Tonight we'll close that one down and see what happens. Must confess I find this quite interesting, a sort of detective story following clues to find who is guilty...

It had a full drain and flush. No changes except the TRVs fitted. I know it had a full can of inhibitor because I saw the empty can. There is one radiator in the utility room without a TRV, I think this had to be left for a bypass? I don't know whether the exchanger is alumininium.

It's definitely air. We read about the match test and tried it long ago. If there is water coming out the vent, how is air getting in?

No LEDs anywher except on the Drayton control box. The pump has a three position switch and it's on the lowest setting. Where is the air getting in? There are no water leaks anywhere. We don't want to run the heating 24/7. As an experiment tonight we will set all the thermo valves to max and...

The pump is on its lowest setting. It isn't easy to get up to the tank.

The boiler is a Potterton Profile with no display. An external pump and a header tank in the loft. It worked perfectly since we moved in a few years ago. In September we had it serviced and had thermostats fitted on six radiators. Inhibitor was added to the water. Since then we have has this...

Ther are three rads up and three rads down. All had TRVs fitted. The pump is on the lowest setting. I have checked all for leaks. Will try adjusting the valves at the weekend. I really appreciate your advice. Thank you!

It's definietly just air. I'll try playing with the TRVs and see how it goes. Thanks for the advice!

It's an old non condensing boiler. Haven't seen any need to change it and the guy who fitted the thermostat valves said it was still working well. I don't want to replace it until it fails.

Yes. Many times but it just comes back. There are no visible water leaks.

Ever since we had thermostatic valves fitted to our radiators we get noise in the upstairs radiators that sounds like air being pumped around. This only happens first thing in the morning when they heat from cold. For the rest of the day it's all quiet. What's happening here? Should I get the...

And where do you think Swann are made?

One security consideration would be whether the camera records to a cloud server, which could be subject to hacking/monitoring. Ours records to a well hidden local NVR, which we can access remotely (and copy remotely) through suitable security measures.

Can you get a power cable out there? Any sort of beam will need a permanent supply

Exactly. Job done!

I reviewed one of those 'home to China' cameras, and checking with Wireshark it was astonishing how much data was going back and forth to China. It wasn't just the pictures, it seemed the PC's CPU was actually doing something else for them. As for 'opening up your router' it's only necessary to...

You don't need a coupler. You can buy a Cat6 extension cable that has a socket on one end. More reliable and takes less space. Choose the length you need. https://www.amazon.co.uk/UGREEN-11278-Ethernet-Extension-Connector/dp/B00QV0K2DI

and deep pockets!

Mine don't look anything like that. Did the cameras come from a reputable source? There are cheap ripoffs about.

Thank you for that link! It does suggest that the current Drayton are a direct replacement. I did read somewhere that a wiring change was needed. Just to be sure, I'll contact their tech support.