The boiler terminals are labelled: Frost Stat (2), Mains (3) and Room Stat/Timer (2).
Use a 4 core (plus earth - not used) heat resistant cable, e.g Tower brand 0.5mm or 0.75mm from B&Q. Make the earth wire safe by cutting back to the outer cover at both ends.
Wiring is:
Boiler L to RF L (brown)
Boiler N to RF N (blue)
Boiler Stat/timer to RF Lx (any colour)
Boiler Stat/timer to RF L1 (any colour)
Remove link between the two stat/timer terminals.
It does not matter which way round the stat/timer terminals connect to the RF Unit.
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