EcoSword LGC

A remote enable should be connected across terminals X3 and X4. These terminals are “no volt” and should not have any external voltages applied to them. The enable can only be used in EXT mode:
Parameter 004 must be set to diS to switch the appliance ON & OFF remotely.

It is possible to plug the Hot Surface Igniter cable into the Mains Power connection on the EBM Ignition Module and vice versa, accidentally.
The Power connection is at the bottom right hand corner of the module and the Hot Surface Igniter connection is top left. Once reversed, the display will come back and you will be able to put the water heater back into operation.

Yes.   Parameter 210 is for a Legionella Purge. The factory default is OFF. Parameter 210 must be set to ON to use this function:

The condense pipe connection from the trap is a European size of 40mm. You can get a push fit waste pipe from Screwfix (code number: 60105) which will fit into the trap. You will then need a waste pipe compression coupling (Screwfix code: 11980) to accept your solvent weld pipe.

The secondary return can be connected into the dedicated port on the side of the tank. Alternatively, it can be teed into the cold feed, which will give the full tank volume of hot water.
Either method is acceptable.