Amanda Boiler Wiring

Dropped a brush in the boiler room and disconnected the mains input to the thermostats. When I opened the cover the lead was hanging free. The cable restraint was not holding the cable tightly in place.

I reconnected the input lead to the first pin and the boiler is firng up okay. I just want to be sure I got it right.

Pins 2 is free. 3 & 4 are connected together. Pin 5 is free and Pin 6 is the output power to the boiler.
Anybody familiar with the wiring on these thermostats.
Trying to figure out how to attach a pic.