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Octopus Cosy 12 Heat Pump Regret: Incredibly Loud, Poor Heating & Constant Hum - Help!

 
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Air Source Heat Pumps (ASHPs)
Last Post by JamesPa 4 weeks ago
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 razz
(@razz)
Trusted Member Member
Joined: 3 months ago
Posts: 34
Topic starter 13/03/2026 10:35 am  

@jamespa So the idea was to turn down the LSV in this one room, to reduce flow rate, and see if the ringing is from water/copper friction of high flow rate.

I turned it down about 3 quarter turns, the room was noticably colder last night than the night before. As for the noise, I think it was a little quieter, but I have no instruments to measure it, and my ears are in a such a state I can't really tell what's coming from where.

I still woke up with a mild ear pain. I'll turn the LSV back to what it was to see if it really makes a difference.

Some of the engineers suggested the issue may be related to the mains water supply. So when it warms up a little (so that the HP doesn't ice up), I'll turn off the mains water and see how it sounds. 

The only thing I can be sure of at this point is that when I work in the local library I don't have all these issues, so the issue is definitely in the house, not some ear condition.



   
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 razz
(@razz)
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Topic starter 13/03/2026 10:41 am  

Posted by: @jamespa
↑

I would focus on the original source of the noise which I thought you said was the pump.  Is it?

So did I. I thought the vibrations were passing through the circulation pump into the pipes, but this resonance thing seems to happen (to a lesser extent) even when the pump is off.

It's also very subtle, the engineers who came were saying they couldn't hear it. Even I can barely hear it, but the problem is that when it's all quiet at night it makes it very hard to sleep, and when I'm in my study for a couple of hours, my ear starts to hurt really badly, and then hurts for hours after leaving the study.

Octopus replaced my old pump :

image

With a smaller one like this:

image

They even put in some kind of rubber bracket to reduce the vibration.
I thought it made a difference, but maybe it was a placebo effect, cos it's now noisy again.

I am at a loss, I don't know where to look for the source of the noise. 



   
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JamesPa
 JamesPa
(@jamespa)
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Posts: 4612
13/03/2026 10:52 am  

Posted by: @razz
↑

So did I. I thought the vibrations were passing through the circulation pump into the pipes, but this resonance thing seems to happen (to a lesser extent) even when the pump is off.

Does it disappear when the heat pump is off?  What about when the fan and water pump on the heat pump are running, but not the compressor(which will happen at times during cycling).

Are you absolutely sure it's the heat pump.  Sorry to ask!  Once one becomes tuned into noises they can become more obvious than they were previously.  I didn't hear my dishwasher at night until I got a heat pump, then, presumably because I was listening for noise in the early days, I started to hear it!  Weird psychology I know, but nevertheless the case.  I live in a fairly quiet area but still at night there is, depending on wind direction, a low pitched hum from somewhere, possibly just distant road noise filtered by the fabric.  I'm more conscious of that than I was pretty heat pump!


This post was modified 4 weeks ago 3 times by JamesPa

4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.


   
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