DIY Doctor

Central Heating Pump High Pitched Noise

Postby Robh1990 » Fri Mar 20, 2020 2:22 pm

Hi guys I've got a DAB Evosta central heating pump and lately its been making a high pitched squealing kind of noise which travels through most of the heating system. I've turned the bleed screw and doesn't seem to be any air in there. Bled all the radiators.
Any ideas, I'm grateful.
Robh1990
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Postby stoneyboy » Fri Mar 20, 2020 6:55 pm

Hi Robh1990,
Sounds like you have air in the pump - you need to remove the central bleed screw completely to clear the air, have a cloth ready to catch the escaping water.
Regards, S
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Postby Robh1990 » Mon Mar 23, 2020 8:38 am

stoneyboy wrote:Hi Robh1990,
Sounds like you have air in the pump - you need to remove the central bleed screw completely to clear the air, have a cloth ready to catch the escaping water.
Regards, S

Turn the pump off first? Do I need to close off the water either side of the pump? Or just open the screw until it runs dry?
Robh1990
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Postby stoneyboy » Tue Mar 24, 2020 12:16 am

Hi,
Probably better with the pump running and valves open.
Water should come out around the pump shaft once the air has cleared.
S
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