Noise from heat water pipe

[ring630]

Hello,

Sorry to write this in English. My Swedish is not good enough to describe my problem. I appreciate you read my post.

I bought an old rådhus built in 1984. I am suffering noise from upper floor bathroom. After days debugging, I found out the noise is from wall in the corner. The first picture shows the location the second one show the recorded frequency response of the noise which stands out at 159Hz. It is continues noise even no tap is on.

I am wondering is it possible it is the heat water pipe generating such noise? what can cause suck noise

Noise is recorded as below
https://drive.google.com/open?id=1-HPGNyk7tjy8XGHGaHsoH8mT0k3naWvW

 

[mrmlz]

I'm guessing you've tried the usual suspect and removed any air from the system?

 

[ring630]

I'm guessing you've tried the usual suspect and removed any air from the system?

I only removed the air from the radiators. This is my first house. I just started to learn a house. What else should I do?

 

[mrmlz]

I'm living in my first house as well so i got limited experience, air trapped in the system was my first guess and if i'm honest also my only guess Sorry! I home someone else has a better idea!

 

[Thomas_Blekinge]

Is the noise continuous or intermittent? Close the radiator valve (first picture) and see if the noise disappears.
Next test: switch off one MCB (miniature circuit breaker, in the electricity box) after the other and listen if the noise disappears.

 

[ring630]

Is the noise continuous or intermittent? Close the radiator valve (first picture) and see if the noise disappears.
Next test: switch off one MCB (miniature circuit breaker, in the electricity box) after the other and listen if the noise disappears.

It is continuous.
close the radiator, the noise is still there.
switch off MCB (the lower last switch in the picture), noise disappears!

 

[ring630]

Is the noise continuous or intermittent? Close the radiator valve (first picture) and see if the noise disappears.
Next test: switch off one MCB (miniature circuit breaker, in the electricity box) after the other and listen if the noise disappears.

Hi Thomas,

can you give me a hint what to do to kill the noise? I appreciate your help.

 

[Thomas_Blekinge]

OK, this is the main switch for your heater, I believe it is a heat pump.
If you switch off that switch you also switch off the circulation pump which drives the water through the system. So the noise is related to water flow.
Most of these pumps have two or three set points for water flow. The pump should be in the bottom part of the heat pump cabinet. Read the manual, probably you can find it on the Internet.
Try another setting of the water pump to change the flow pattern.

 

[ring630]

Thank you very much!

 

[ring630]

OK, this is the main switch for your heater, I believe it is a heat pump.
If you switch off that switch you also switch off the circulation pump which drives the water through the system. So the noise is related to water flow.
Most of these pumps have two or three set points for water flow. The pump should be in the bottom part of the heat pump cabinet. Read the manual, probably you can find it on the Internet.
Try another setting of the water pump to change the flow pattern.

Finally, I killed the noise by slowing down the water pump. Now I can have a good sleep and a quite Christmas. Thanks very much!