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Just had my ufh pump changed and now my boiler makes this noise.. How do I fix this? Is there air in the system.

Although the numbers are slightly different I'm guessing the GRUNDFOS UPS3 15-50/65 is the correct one?

Another question. If I was to replace it myself do I isolate the water with the red and blue knobs? Thanks

Thanks Checked and power still goes to it looks like the pump is dead. As an estimate how much would u expect it to cost to replace the head?

Hi all I have a grundfos ups2 as pictured below. Went in holiday for 2 weeks and came back but the green lights don't light up? Does that mean no power goes to it? Thermostats seem to work fine. Checked to see if it was seized up and seems to turn freely with my screwdriver. Any help appreciated