Kevin77

Hi there, Just spotted this. We didn't get charged, and I was adamant that the noise from our unit was "not normal". I've had so many issues with the install and the heat pump unit, Mitsubishi seem to accept at this stage there is an issue. Where did you get to with your issue? BW

Hi all, Just thought I'd follow up with this and some positive news / thumbs up for mitsubishi. After reviewing things and a site visit they have replaced the unit completely which has resolved the noise. Thumbs up for mitsubishi customer service overall (irrespective of replacing the heat pump).. kept me updated and made fairly quick decisions. Now to work on improving the COP! (More to do with system design I suspect). Kevin

No need to apologise. This was just taken in Heating mode about 20 mins after start up - 0 Deg external temp. Slightly envious of being able to her the rain! This was taken at 1m away. Monday at 21-24 - 0 deg external temp (online-audio-converter.com).mp3

Thanks that's helpful. Very quiet in comparison. Guess I need to speak to mitsubishi again

@Nickfromwales it's fitted with flexible hoses. So general consensus is - it's not sounding like it should?

Hi there, Thanks for the reply. It's date of manufacture is June 2020. It's an R32 model. The original recording was taken when the unit was running at a stable flow temp. Do you have the opportunity to take a sound recording of your unit for comparison? Any other suggestions welcome before I go back to Mitsubishi again! I've added another recording in which you can hear the noise change as the compressor steps down I think. Heat pump DHW cycle. (1).mp3

Morning all, I hope this is an appropriate post - apologies if not. We have a Mitsubishi Ecodan 11.2kw installed in a 4 bedroom semi detached house. There were lots of issues with the initial install and following a MCS complaints process had the system reinstalled by another installer. The system now works relatively well and is running in Weather compensation mode. We've had some problems with the ASHP noise levels. Mitsubishi have been out several times and replaced the compressor (as was potentially damaged by running with transit bolts left in from the first install). They've also upgraded the software to change the frequency of the compressor due to resonant frequencies and refrigerant noise. Both of these have helped and when flow temp is stable the unit is relatively quiet. However, there is still noise from the compressor which is audible above the fan noise. At lower temperatures e.g during the latest cold snap (-5 Deg C) the noise increases markedly. It was audible in the attic and neighbours have commented. I've attached a recording of the heat pump in normal operation taken at approximately 1m away which illustrates the noise. Anyone out there with a mitsubishi heat pump have a view on whether this is "normal". I'm really interested in the noise itself rather than the volume. PXL_20221223_085441254 (audio-extractor.net) (1).mp3 Any advice appreciated - please let me know if you need more details or a better recording!