Mitsubishi fixed my broken unit – ******** Update 4th August 2025 ********

A senior Mitsubishi Tech came to my house to investigate. They discovered that something was not quite right with the outdoor unit. The tech was extremely thorough and spent a good 1.5 to 2 hours taking measurements and putting the unit through its paces.

The next day I received a message saying that the unit was not performing as designed and they would be replacing it.

1 week later - Mitsubishi organised the original installers to come and replace the unit. The senior tech from Mitsi was present to ensure all was done correctly.

The end result is that i now have a unit that is much quieter and still heating the house. The new unit is about 30% quieter in the top range, plus it ramps down now - i did not observe this before. The temp produced is also much more pleasant and the power usage is much less.

Thank you Mitsubishi for taking ownership and honouring your warranty.

********Update 11th July 2025

The noise from the Aircon unit is as noisy as every - very irritating - I urge everyone that is looking for an aircon - DO NOT BUY a Mitsubishi Electric Aircon!!!

To see more info and videos showing the loud sound check this out: https://jaderoses.com/mitsubishi-noise-complaints.php

The response from ME was disheartening - they will not help resolve the issue even though the noise is unchanged a few days later:

2/7/2025 Work Performed - attended site, checked over unit and found unit to be making a really loud noise. Took decibel readings and they were 85. Opened up unit and found that packaging foam was still stuffed at back of compressor. Removed and tested again. Much quieter (****Note this is not true). Took compressor winding readings see task photos Reported back to Mitsubishi Electric who advised they will cover the attendance in this instance.

No images were provided of the compressor winding readings.

****** Update 2nd July 2025

Mitsubishi Electric was fast organising a tech out to troubleshoot. The technician found a 20cm chunk of packing foam wedged behind the compressor.. its now been there for a year. Supposed to remove it after installation but the installer (DACS, Canning Hwy Perth) didn't, even after my complaint about excessive noise the day after the install.

The compressor measurements are apparently off and its running at over 80 DB for heating. Should be in the 50's. Removing the packing foam has helped a bit, but probably not enough.

Now we will see what Mitsubishi Electric will do.

****** Update 29th June 2025

Just wanted to add to my review. I tried to fill out the Mitsubishi Electric online support form. The form does not work. I tried calling them by phone and finally managed to get through! The person was a human and they told me to send the form by email. I sent the email through on 23rd June to an address i found on the internet: CustomerCare@hvac.mea.com

The lady said this email was incorrect for Mitsubishi support and i should email: customercare@meaust.meap.com

I have sent them my invoice and details on the 27th June, 2025 and awaiting a confirmation or response of some description.

It has been very difficult to access Mitsubishi Electric support and I am really hoping they will attend to this case.

I was just out measuring the decibel level and its well over 74 DB according to my mobile app. Its very noisy and goes through my double brick walls - it ok if i wear noise cancelling head phones but otherwise the frequency is strangely irritating and i actually don't mind a bit of noise. I uploaded a video with sound in link below:if you want to see it in action at over 70 DB.. i believe it goes max about 80DB but i am not a sound engineer.. i can say.. its loud!

https://www.onlymates.com/mitsubishi/mr_slim_aircon.mp4

The system heats the house nicely and seems to work ok. The issue is that the noise coming from the outside compressor - the frequency and pitch does ramp up and is a little abrasive if you are close to the unit or in the rooms next to the unit. Maybe will take some getting used to.

Just tried to reach ME on phone and it hung up on me.. 1300 651 808

Tried calling again: 1300 651 808 (Selected options #2 for existing customer, #2 for not a dealer, #1 for customer care and after about 1 minute it just hangs up automatically.

Luckily was able to reach installer and they have come out and said the unit is operating as designed.