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I'll change the hot water to 60 tomorrow as I'm in the other room right now. Will check the back boiler make/model and boilerstat tomorrow too, thank you!

There's just one room prt2 thermostat with temperature dial, it's located in the hall. The thermostat with 75/85 max has ptt2 written on it, it's next to the cylindrical boiler in the airing cupboard. Thank you for not giving up on this! I've ordered a replacement thermostat for prt2 but am yet...

Thank you so much! So much useful advice!

Just checked the dial next to the boiler, it showed 75, I turned it up to 85. But I suspect it's the dial for hot water because the lights aren't on, and hot water heating us turned off at the moment.

The below light gets illuminated/green when the heating comes on, it also clicks then. The problem is that it only comes on when it's let's say 12-15 degrees in the hall while the room thermostat dial is set on maximum 30. Not sure about the frost protection... Yeah, it's normal, I was...

Here's the photo

Sorry, wasn't online, have covid and wasn't feeling great for a few days. Anyway, here's the photo, I can also take the photo inside if needed? Will try to get a multimeter today.

Oh sorry, I meant cold, will edit

I'll check the hot water cylinder in a few hours but I don't thing it's extremely hot. The radiators are only hot when the heating is on, otherwise they're cold. It just looks like the thermostat misreads the temperature but I might be wrong here.

Oh ok re valves. It's potterton prt2, really old one it seems :( Thank you.

Hi, I have an old style back boiler and can't get my ch work. The dial on the thermostat is on maximum but heating comes on only when it's extremely cold. Hot water works ok. I'm thinking the thermostat could get dusty inside as we did some plastering but no changes after I cleaned it. I...