I had a senior engineer from Vaillant come to check my 7kW and he ran some tests. He concluded that the compressor was noisier than it should be and recommended that the compressor is replaced so I’m having that booked in. Yesterday evening the resonation through the downstairs of the house was very loud with frequent defrosts…
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Thanks for sharing. I would be very interested in a before and after comparison of noise levels. Also, I wonder whether they will replace with an identical compressor or whether they have identified a general issue with these compressors and replace with an improved one.
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I’m not sure but maybe those without issues have newer units? If so the latest compressor may be fine. Is there a way of finding out the manufacturer date of a unit?
Apparently the serial number gives a clue, mine starts as 2124 so maybe the 21st week of 2024?
I found a reference that says (at least for Vaillant boilers) that 3rd & 4th are the year and 5th and 6th are the week. Mine starts 212411, indicating 11th week of 2024, which makes sense as it was installed at the end of April last year.
Ah ok, mine is 212429 so 29th week of 2024 which is June time. Mine was installed in November so must’ve been sat in a depot for a while.
It would be good to know what numbers those without issues have.
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My 7kW has this problem and the serial number starts with 212227, which is the 27th Week of 2022 (w/b 4th July 2022).
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Ours is 202428 (consistent with installation date) and we don’t have a noise problem (that I’ve been able to find) and you guys with a problem clearly found it easily.
Interesting, so yours was manufactured a week before mine and doesn’t have the issue, so there goes my theory!
New compressor arrived today and is being fitted Wednesday. Fingers crossed!
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Would you be able to take and post detailed photos of the original and replacement compressors?
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I’ll try my best
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do you have a case number or anything written down that you can share?
The compressor has been replaced. I wasn’t able to get photos but I asked if there was a difference and they said no, it’s exactly the same part. It sounds quieter in the house now but I do think there is still a buzz at high speeds. It’s almost like the pitch of the noise is not as high.
Here is the original video and a new video to compare.
Before (111rps)
After (108rps)
I don’t have a case number no but if you contact Vaillant Group Service and say you have a noisy compressor I am sure they will investigate. They have been incredibly supportive and attentive. The engineers are very good.
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Thanks for posting the videos. Doesn’t sound like it’s made a transformative difference, is that fair to say? I was helping a friend with their Midea heat pump recently in temperatures around freezing and the lack of buzz was very clear cut compared to the Arotherm.
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My impression is that the problem is a lack of vibration isolation between the compressor and the case (and other components). While the compressor isn’t exactly quiet at high speeds, it only becomes a nuisance when you get resonant rattles in the casing and vibrations transmitted into the building via pipework. A like-for-like compressor swap seems unlikely to resolve these issues.
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I would agree with you. I’m curious as to what the 5kW sounds like running at 100-120rps up close. Is anyone with one of these units able to force hot water on Normal mode and record a video like I have?
If there is a distinct difference between the 5kW and 7kW then I’ll raise this with Vaillant.
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The resonating sound inside the house has pretty much gone though I will wait for the temperatures to drop again next week to judge completely.
-67dB at 97Hz recorded by the wall it’s against.
I can hear it slightly ramping up at say 70rps and again at 90rps but the sound disappears…
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Hi Dean, I have a 5kw unit which i can record the required video over the weekend, although I’ll have to manually change the boast for during the day, as it usually just runs overnight.
Russ
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That would be great! Thank you