Hive mini installation

[meiteniite89]

I have a Ideal combi boiler and had receiver installed. Unfortunately thermostat been lost by previous owners and now we are looking to install Hive Mini.
I have old wiring to Neomitis picture, but struggle to find the way to wire new Hive receiver to match this.
Need help as attempts so far only light up the receiver, but not make boiler to fore up.

 

[ericmark]

The Ideal boiler may have OpenTherm I note the new Hive also has OpenTherm

so question one has to be how was the old thermostat set up?

 

[meiteniite89]

This is the old one, unfortunately not the opentherm

 

[CountryFan]

Looks like 24v is being used, so will be transfer 3 and 4 to 1 and 3 on Hive with L and N