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Grunfos booster pump issue

Kealyboy · 2025-01-30 21:17:33

Hi my grunfos booster pump is not working right on the hot water side it’s pulsing and no water pressure. Cutting in and out and very noisy . On cold water side it works perfect Any ideas? when power is isolated to pump water is flowing ok does not seem to be a blockage or air

30-01-2025 10:17PM

#1

Kealyboy

Registered Users, Registered Users 2 Posts: 382 ✭✭

Join Date: July 2013

Posts: 227

Hi my grunfos booster pump is not working right on the hot water side it’s pulsing and no water pressure. Cutting in and out and very noisy . On cold water side it works perfect Any ideas?
when power is isolated to pump water is flowing ok does not seem to be a blockage or air
image.jpg

0

Comments

#2 06-02-2025 12:45AM

whizbang

Registered Users, Registered Users 2 Posts: 2,050 ✭✭✭

Join Date: September 2009

Posts: 1993

Probably impellor. You can get them cheap enough.

0
#3 07-02-2025 10:50AM

hydrus21

Registered Users, Registered Users 2 Posts: 150 ✭✭

Join Date: March 2021

Posts: 137

Has the hot water temperature being increased?
High water temperature can cause cavitation around the pump impellor.

0