I have Keston boiler with pressurized CH system. After I cleaned the CH with Fernox Restorer and flushed it then added Fernox Protector, my pump (Grundfos) seemed to get a bit noisier than before (lauder humming noise). I've bled the system several times and it doesn't seem that there is air in it. I've set the pressure to 1.4-1.6 when hot. Any ideas what may cause the pump to be noisier and how to fix it?
noisy pump after cleaning the CH
- Thread starter ivanov
- Start date
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you bled the system try bleeding the pump 
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It is set on III for 13 rads but it was on III before when it was not so noisy. I've bled the pump as well when I bled the CH. BTW I've red in some of the previous discussions that if the pump is positioned vertical (like mine) it doesn't have to be bled, but I bled dit anyway. Also i have auto Air vent next to the pump but when i push it there is no air just a pressurized water comes out.
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