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Damn, thanks.

Brill thanks Jackrae. By the way, can I tighten that nut as tight as I can? It’s pretty tight now and still drips a bit.

It's 8mm. Thanks both. Andy: You're not wrong but I need other tools to blame for my workmanship! :D

Cheers both. Yes water does come out of the rad pretty sharpish! I'll leave well alone.

But the system pressure when cold is zero.

Ah. So I can ignore the pressure reading?

Indeed. That's why i want the proper tool for this job.

Well true but every time I use one I "round-off" the nut.

The pressure in my combi boiler (oil fired) seems to vary hugely. When the heating is on it is at about 1 bar. When the heating is off it can be as low a zero but then rises to 1 bar after a few minutes after the heating comes on. Other than this everything seems to be fine; both the heating...

The "tap" where the central heating is drained has a square nut on it. It's about 8mm square. I don't have a socket in my set that fits this (or is even square!). What is the tool called that fits this so that I can search for one? Thank you.

Yes, they have a thirty day return policy - excellent!

Well, at the boss's insistence I "just got on with it" got a new thermostat! Turns out it is the probe that is knacked - bugger!

Oh right, yeah, durr. Cheers again mate! (“furloughed advice”, like it, gonna use that)

Yes, that’s what I thought and I wonder how “technical” their “technical staff” are anyway. Indeed. However, a floor probe would be mightily expensive to re-embed in the floor; especially as the boss would want all the tiles re-done. New floor? Gulp!

Hi, me again, sorry to be a pain. I had asked Warmup about the situation earlier and they finally got back to me! They say that even though the probe's resistance measurement looks ok it is still at fault. They got me to change the target to air temp (I was wrong, mine does have "air...

True, true, I deserve that. As you say, “sometimes it’s useful to have an idiot around”! :) It’s just that I think of a “thermostat” as being both the controller and the sensor together. Replacing the box is a far better option than the probe. Cheers.

Cheers mate, thank you. Just to be clear: it’s the “box on the wall” not the probe in the floor that has died, has “joined the choir invisible “?

Sorry, I didn't look at the display properly! I just measured it again and it is 13.36kohms, that is kilo-Ohms. The floor temp was 18.6degC - roughly. I think the probe is an NTC10K. What a fool. P.S. Mine is a very old one with no "air" option - worse luck.

Hi, The probe is 13.5ohms and the element is 87.6ohms (a small bathroom). So the probe is knacked then?

I have electric underfloor heating in the bathroom (Warmup with 3iE thermostat) that has been working perfectly for over nine years. Today, the temp is reading 31.5C when the heating is off and the floor is cold to the touch. There are no errors showing, nothing has happened (no bumps, power...