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Many thanks for input and link to manual - connection it does appear to be a switched live with neutral picked up elsewhere

Whilst considering a replacement of a Danfoss/Myson FH-BU where much of the wiring disappears into trunking making end-to-end searching of the wiring very difficult, I have two twin core cables, each with their blue wire cut off at the external sleeve, leaving the brown wire of each cable...

The existing wireless thermostats are identified by the receiver in the FH-BU unit i.e, only the thermostat is needed, as the receiver is integral to the FH-BU

Many thanks for input. For sure Danfoss will be closed for Xmas but they acknowledged the enquiry on the 5th of December and I'm afraid I need to keep progressing this even when they don't answer. Your picture is accurate and is the unit the Myson appear to have badge engineered for resale. We...

The Danfoss units work at 433mhz but others seem to be 868mhz and therefore any proposed replacement must be 433mhz, which I have been unable to locate and hence the question I raised. Danfoss support appears non existent as they won’t answer emails.

Do all wireless thermostats work on same frequency and message format?

I have a Myson wireless UFH control system 230V with 4 of Myson/Danfoss FH-RT wireless thermostats in 4 zone UFH system utilising a Grant ASHP. The FH-RT thermostats are now unobtainable - to avoid changing the whole system out has anyone a suggestion for a replacement wireless thermostat?