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@RandomGrinch - many thanks for your help. I reinstalled the Hive receiver this morning, wiring as per your suggestion above. I initially pressed the "boost" button on the thermostat and the boiler switched on and the radiators started warming. Using the Hive app, I stopped the boost and...

Not sure - will give it a go tomorrow when I have time and give it some tests. Cheers!

Thanks for the replies - bit pushed for time today, so will have another closer look at this tomorrow. Picture below of the Hive receiver - pretty sure I ordered the combi version! So you said above, "This is what we would hope to replicate, by using the Hive receivers terminals 1 and 3." -...

Hi. I can see similar discussions but none have the same wiring as mine - so apologies in advance for posting something similar! I have a Main combi boiler - installed in 2020 - with an EPH CP4 programmable RF thermostat and receiver and have decided to upgrade that to Hive for the convenience...