Grundfos Hardware & Accessories - Recent Questions, Troubleshooting & Support

All you do is pop off the cover

Grundfos 599388 ... | Answered on Oct 24, 2019

Check the breaker. Check the reset on the motor. Wiring connections. If you have power to the motor & motor doesn't need new motor.

Grundfos... | Answered on Oct 24, 2019

Normally you can just replace the motor with out changing the entire unit. A new gasket should come with the new motor.

Grundfos... | Answered on Oct 24, 2019

Replace it.

Grundfos... | Answered on Mar 17, 2019

Last one I installed, I used a PIR sensor to control it, so that whenever someone walked towards the bathroom or kitchen, the pump will start up and run for 15 minutes. It really depends how often you use hot water - if only certain times of day, then it would be wasting power to run the pump, and heat loss from the pipes (unless very well insulated). If you have a regular pattern of use, then you could use a timer/programmer as you would on your normal hot water or heating. If your piping is plastic, then don't run pump continuously, as some plastic piping is not recommended for continuous circulation at normal hot water temperatures.

Grundfos... | Answered on Oct 23, 2017 and enter grundfos pump ch 230 in the search area. Make sure to enter with the proper spacing.

Grundfos... | Answered on Oct 21, 2017

Sounds like the diverter valve is not working. In order to heat the hot water, it needs to direct the circulating water to the heat exchanger rather than the rads.

Grundfos... | Answered on Sep 21, 2017

Look at it closely to make sure it is not a nipple threaded into the pump that can be removed and replaced. If it is indeed part of the pump you may be out of luck. You can take it to a competent welder that may be able to weld it but it may distort the pump body so it will not work. Good luck!

Grundfos... | Answered on Feb 17, 2015

1/16 horsepower = 48 watts
120 volts divided by 48 watts = 2.5 amp


If you need further help, I’m available over the phone at

Grundfos Comfort... | Answered on Sep 26, 2014

Contact grundfos
buy new pump


If you need further help, I’m available over the phone at

Grundfos... | Answered on Aug 27, 2014

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