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Stem, thanks for the heads-up re terminations. I'll bear that in mind when I come to install one. The SONOFF is far from perfect from the reviews I have read online, but on the whole, it seems a reasonable option and if all goes pear shaped, not difficult to re-instate a conventional boiler...

Thank you for all for your input, however after much searching the SONOFF 4CHPROR3 4-Gang Wi-Fi Smart Switch with RF 433MHz RF Control (appr £30) is a fully configurable substitute for a conventional timer and will do exactly what I need for a fraction of the cost of a Hive. No additional hub...

My Honeywell ST9400C boiler controller has failed after less than 10-years (from the widely reported flashing display fault) and I am considering replacing it with a Hive Mini Dual Controller (CH+HW). The receiver wiring looks to be configured exactly as per the old ST9400C back-plate (N, L, 2...