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I can't find the thermostat anywhere, despite the tenants suggesting where they left it. Can I replace just the thermostat and pair it with the existing relay unit, or do I have to replace both? The radiators warm up when I press the override button on the (separate) timer controller. Given...

Thanks for the positive identification.

I took the photo when I visited the property recently, but I didn't think to look for a thermostat, because there wasn't one originally and I didn't have any idea what the relay box was at that stage. The property is now vacant, so can't do that. I'll go back to visit soon and identify the...

The property has been let to tenants while I've been living at the other end of the country.

Great. Thank you. In the meantime while I'm away, do I need to worry that the central heating might not be coming on in the cold weather...?

All I know is that it's a "Honeywell wireless room thermostat" (as per an old invoice), although I've never actually seen it and I'm away from the property at the moment.

OK. Thanks. So is it likely that the relay is controlling the central heating or the hot water? Or could it be either? If it's in fail-safe mode, is it likely that either the central heating or hot water is not working...? What's the worst that could be happening...?

I have a box in the airing cupboard which I don't recognise. The box has two LEDs and one button. The bottom LED is flashing red. The other LED is off. See attached photo. The original boiler was replaced about 5 years ago with a Valliant ecoTEC plus 415, but it looks as if the original...