Heating not working - Grundfos pump issue

Hi all,

I have an old Combi boiler for which the heating has stopped working. The hot water is fine, and I think I've isolated the problem to the pump.

The pump is a Grundfos Alpha2, and it has usually has two numbers, but it is instead showing two dashes ( -- ). I think the propeller isn't spinning inside as there is no 'buzz' and the pipe above it is hot, but below it isn't.

Does anyone know if there is a simple fix for this for an amateur to do at home? If not, how much would this cost to repair?

Thanks.

It looks like you can lever off the electrics module and there is the usual rotor screwdriver slot underneath to give it a spin!
The beginning of this sort of shows it:
fault code of "- -" means:


and here is another approach: