I recently changed my pump (Grundfos UPS 15-50) and followed the correct procedures i.e drained system throughly, flushed out all the crap and added Sentinel X400 sludge remover and run the system for about 3 hours and then re-flushed. After adding Sentinal X100 inhibitor I have found that when the CH is running (not the HW) there seems to be a surging water noise which is making the pump make a whirling noise with the sound of water being surged also. The system has been throughly bled but this problem still exists. The CH has only just been turned on again (for the onset of winter) so was wondering if this problem will just sort itself out when the system calms down to it's normal operating cycle.
Can anyone out there advise?
Can anyone out there advise?