Grundfos Selectric 15-50 - noisy when on, intermittent banging?
For the last few weeks our pump has been getting noisy, now we get loud vibration/banging noises that are sometimes short like a car turning over, sometimes as long as a minute. The water is still heating up but takes a long time.
The pump gets too hot to touch after being on for around 20 minutes.
Any ideas?
Nicky, August 2010
