Hi guys,

I have the Grundfos CH2-50PC installed bought from Zheilwane.

At first, it was rather quiet and only can hear a hum when the pump is in use. Now, after about 2 weeks moving in, the pump has become rather noisy.

I did empty the water tank a couple of times, once to clean it and again when I installed the water filter.

Any ideas how I can get it back to the quiet hum again?

I have tried switching off the pump and letting the water run for a bit. It doesn't help.

I'll ask my contractor go up have a look when he comes round next time. I don't have a step ladder that is tall enough to climb up into the roof. haha.