You need to put a link between live and 1 on the backplate of the hive receiver. The receiver will switch from 1 to 3 when the hive thermostat is calling for heat. Keep your time switch at on, at the boiler and use the hive thermostat set your on/off times and temperatures.

You won’t need hw off and ch off, hw on in to 3 and ch on in to 4 on the hive backplate. You will also need to linkout the thermostat wires, normally the sensor would be removed and the wires connected together and stuck back into the wall then fit the hive thermostat on the wall over the hole that the sensor was covering.