Might as well post some internals now I have paid them.
Cosy hub: Seems very similar to hive. esp32 rover and zigbee radio.
Heat pump:
Backwards firing smd leds… gold immersion signature… STM32G4… some nice effort went into it.
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I have not long had an Octopus heat pump installed and am experiencing exactly the same issue you have.
It’s not loud, but more like a vibration that is in the walls. And I’m certain it’s because it’s so close to my property and sat on a paving slab. (The sub floor is poured concrete so no where for vibrations to dissipate).
I haven’t paid the bill yet, I’m waiting to be contacted by the R&D department but have been told, “it’s hard to raise a ticket because there is no evidence”
I’ve told them they need someone out to the property and it’s not something I can record on a phone.
Glad yours is better now. Fingers crossed I get a similar resolution!
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Octopus were very proactive in finding the sound for me.
I couldn’t record it very well on my phone. Engineer had to come “experience” it, after it was experienced they worked to solve. I could record it with my RTA gear.
The office seemed happy to not progress with handover and payment until it was solved.
If it’s a low vibration like mine, it will come “out” of the walls at various null spots inside rooms and be clearly audible with a ear on a wall.
That being said it did get better after a week, but that was likely just the compressor settling in, the vibration / fan noise was always there.
I still think the root cause is the fan itself or the geometry of the air flow at the top of the cosy. It could be solved with a mass dampener at the top of the unit,.or by isolated legs. Or a look at the airflow. My house is similar; all beam and block suspended, which probably does contribute.
Super smart people have provided lots of advice about structure-borne vibration that causes walls or joists to vibrate and that is then heard inside as a low-frequency hum.
The dB(A) for the unit is meaningless because those test filter out low frequency.
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@Swwils how you finding the Cosy with the base now that you’ve lived with it a bit longer?
I’ve got a similar issue (Cosy 6) with low hum / vibrations through the wall and resonance around the house. Similar construction with block and beam foundations. Pipework runs up the wall and through the loft space. I can feel vibrations on the pipework in the loft. There are flexi’s which are fitted inside the plastic trunking that runs up the wall but I can’t help feel this should be done closer to the unit and ideally not on the wall. Also, some of the pipework touches two beams which I think could be another source of vibrations. It’s frustrating as the actual fan is near silent and performance is brilliant. Just battling with solving this issue.
Hello hello,
The leg base mostly solved it. My EVA blocks even more so. I can only really hear it at maximum ramp for a hot water call but it’s nowhere near as intrusive as it was.
Have they not put the flexi directly from the unit to the wall? Maybe ask them to troubleshoot and suggest a service bend with the flexis.
Other than this everything is great the performance has been excellente.
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Can you post some photos of your install, with all of your mods visible? Intrigued!
Sure. You could calculate the required material and thickness with some maths but these were £15 on amazon for 4.
The leg base feet are kind of a hard plastic. So I’m sure later versions will be rubberised. You can easily just wind the legs up one at a time to place these under without moving anything.
Octopus have said they will visit and put rubber bushings around the central “bolt” too. I didn’t want to move the unit off the base on my own to do this.
In other countries, it’s very common to also have an isolating mount/strap for your first fexi joint to avoid vibration transfer, also your flexis should not go through the wall… basic isolation practices.
Does it ramp with fan speed? If it doesn’t your actual compressor mounts would need to be looked at. 