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I cant tell if they're pumping or not. When I press the grey button on the Grundfos pump they dont light up or anything.

Is there any way of telling without a multimeter?
 
They're a fairly elusive bunch around here - soonest I've been given is two weeks.

Probably need to tell them that I want a whole new heating system (which at this point I actually do) and see if that sparks any interest.
 
My take on the problem......

Those grundfos pumps are absolutely Rubbish, they were a quick and late design to get on the modulating pump market. Whip it out !!!!

The leds will be lit, but the actual performance will be far under.
 
Yes, a new grundfos pump. Those alpha 2’s are a poor pump and haven’t got a great life span
 

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