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Ah yeah suppose that would be a good start! Will try. Another though I just had, perhaps the blockage is after the two returns join up so the water coming out of the return was really being forced back from the return of the other rad..

Hi all. Upstairs we have 3 radiators and a bathroom towel rack. The radiator and town rack on one side of the house work fine. The other two radiators do not. On another job we've had a plumber mention that those two radiators probably have blocked pipes and will require floors up and...

Just to sign this one off.... the heating guy came over, was shocked at the old thermostat cabling. That whole lead/connector was ripped out and replaced new with the hive. I had hoped I'd have managed it myself, but from watching him tinker inside the boiler, its definitely something I wouldn't...

Cheers for the heads up @RandomGrinch To be fair I have the heating guys coming in for a separate matter in a few weeks. Perhaps I'll just get a new cable run set up, get the hive receiver installed, and then just let the engineer spend 5-10 mins wiring it to the boiler, just in case...

Thanks @CBW ,The above grey sheathed (looks like 4 strand) from boiler to thermostat is about 5m secured along the garage ceiling and through simple hole to the inside, if ease of access was what you were checking

So as it stands, would it be safe to simply cut off the power via the breaker at the consumer unit, remove the service panel on the combi, and just replace the whole cable run from the service panel to the wall location? It's become pretty clear now that where the neutrals/earths/lives and SW...

Hrrm having removed the outer case and had a check, but not at the actual service panel. Luckily, yes the white IS indeed not connected to anything so just a red herring. However, ..I suppose first to ask, is the earth being exposed a risk (as shown)? I imagine if it's earthing then it's safe...

Suppose it might be relevant to note, when checking voltages, there's 240 when I check earth/3, and earth/1 when calling for heat. This #4 never really does anything, perhaps is a red herring. That being said, I've found a manual page for this thermostat, and while the printed circuit diagram...

Thanks all. Indeed i did forget that important info. It's a WB Greenstar 34CDI Combi. Will check the backend in the next day or so.

Hi All. I'm looking to replace my Honeywell T40 with a Hive system. When checking the current thermostat, the wires are in terminals 1/3/4 and earth. In all documentation I've seen and forum posts, it always mentions terminals 1/2/3 and earth. I haven't yet checked the backend of the wires...