Heating not working - Grundfos pump issue

[bengordon]

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.

 

[Basher]

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: