Siemens RDH 10 RF Thermostat not triggering heating?
I have Siemens RDH 10 RF Thermostat and a Worcester Bosch Greenstar 30CDi combi boiler. The battery in the thermostat is fine. The green light is on on the wall sensor. When I turn up the thermostat to demand heat, the orange light flashes on the receiver, but the boiler doesn't fire.
The boiler does fire for hot water. Any advice please?