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Thanks guys, so the best thing would be to get an engineer out to change this rectangle looking part?

What does that mean exactly and is this a problem?

Hi all, We have a vaillant 438 boiler. Are these rust stains normal? Many thanks

Hey all I hope you can help. We have an eco etc plus 438 boiler with a evocyl water tank upstairs. We have two vaillant thermostats, the vr720 and vr92 with weather compensation. There are two heating zones. With 8 rads upstairs 5 downstairs. Lately the boiler seems to drop to 50 and go up to...