Mitsubishi Electric UK Anmeldelser 

I have a Mitsubishi heat pump. It’s fine when it works properly. Wait until you need a part in the winter. My house has been cold for nearly a week.i have had to buy more electric heaters to keep warm and I am over 80 years old. I wish I could go back to a different form of heating. My engineer then ordered the parts from his supplier using the part numbers given to him by Mitsubishi but the parts could not be sourced. It eventually transpired that my engineer had been given an incorrect part number by Mitsubishi. Need I say more. Hopefully, the correct parts will arrive and my heating will be fixed.

Dean was very thorough and explained with great detail about the Heat pump service.
He also offered some very useful advice.

We had an installation in April ,2025. On 20th November when it got really cold we found we had a problem. The flow rate was 7, when it should be 21. So system running at 30%> Here we are 13thJanuary and despite numerous phone calls, emails and visits from engineers all diagnosing the same problem Nothing has actually been done. We're both in our eighties. Very bad service.

Michael Brocklehurst our area sales guy is an absolute diamond to deal with. On the phone whenever needed and never rushed.

Cannot fault 1 bit.

Joe arrived exactly as he said in our phone call. He diagnosed the unusual fault immediately and rectified it without any fuss.
Explained what he was doing at all stages.
Then discussed how to operate the system more effectively. Absolutely satisfied with his service.

I had an ongoing issue with my heat pump system. Mitchibusi sent an engineer called Pete who spent several hours carrying out diagnostics on my boiler and pump system identifying issues along tne way. He was cheerful, friendly and efficient an essential combination if you have soneone on your premises for several hours. He even rang me back the following day to check up on things. First class.

Guys - I'm still waiting for a response since the 3 Dec 2022. I also inquired about my system on the 1st December 2025. Why does Mitsubishi continue selling ASHP's but struggle to provide basic customer service. I would appreciate a follow up with my enquiries.

Peter was as per usual very professional, proactive and helpful answering my call during the Xmas shutdown break which resulted in a quick fix. Always goes one step further.

Awful experience
I have been a Mitsubishi Electric UK customer since installing my Ecodan in 2021, and a "3Diamond Cover" subscriber since 2022. Despite paying over £400 annually for what is marketed as 24/7 priority service, my experience has been nothing short of awful.

Getting in touch is nearly impossible; the "24/7" number is difficult to reach even during standard office hours. In October 2024, when asked to pay for a renewal, I requested a pre-winter service for peace of mind. Despite monthly follow-ups, I wasn't given an appointment until May 1st, seven months later. To make matters worse, after I took a day off work to be home, the technician never showed up. Customer service initially claimed there was a delay, only to admit later that afternoon that nothing had been scheduled at all.

When I informed them I wouldn't be renewing this year due to dissatisfaction, their response was completely indifferent. There was no attempt to investigate my issues, just a generic "sorry" and "feel free to reach out in the future." If you're looking for reliability and value for money, I would suggest looking elsewhere.

Outstanding heating engineer. Paul diagnosed my heating system problem remotely with a few probing questions, and identified a faulty actuator which until then had been hiding in a cupboard. He then explained a temporary fix til I can get it replaced, so the upstairs rads now back on and Christmas reinstated. Outstanding service!

No heating or hot water for 3 months.

Mitibishui has been absolutely useless and I literally cannot believe that this is legal.

The worst premier level service imaginable. Response times, for the top level of cover measured in weeks. No out of hours service. If you have a problem at Christmas good luck! Calls are not returned, the organisation clearly dreadful. It is nothing close to what the advertising claims. The engineers are good, when they eventually show. Best described as rubbish service.

Very helpful guy Ross helped talk me through problems with my air source heating system. Let's hope it's resolved now. A bit stressful doing all the reset over the phone. Very patient. Still need a visit to physically check the whole set up.
Unfortunately took 3 months to get the call but not the fault of Mitsubishi but the original installer.

We have been on 3 Diamond cover for 10 years now. Last year after the annual service we were informed that Mitsubishi now recommend we add an additional curculation pump, which would cost over £400. We agreed to pay this and the pump was duly installed. The pump is very noisy. The installation engineer said it would become quieter over the next week or so. It is still noisy, so much that, it is making part of our house uncomfortable. I have phoned multiple times over the past 8 months only to be told it is with the schedulers. Soon Mitsubishi will be requesting next years subscription fee for 3 Diamond service. I am in a quandary of what to do? No one at the Home Help number seems to do anything.

Update 24th January 2026
I have submitted all requeeted information to Mitsubishi and received apologies and a request for video with audio of the offending pump which I have gladly supplied. I have continued to enquire about progress in the matter only to receive the same response that it has been sent to the engineering team. Meanwhile we have this constant whine from the pump.
I believe they are not willing to sort this out or there AI led processes do not find a solution and my issue is left to continue. I entered into the 3 Diamond Support contract in good faith and have accepted every recommendation and charge they have made believing I was keeping my installation at peak condition. All I have received from Mitsubishi is apologies and the explanation the the engineering department are dealing with it.

Chris the engineer was very friendly. Let me know when he would arrive. Sorted out a leak and gave some advice on using our heating pump.

He was polite and efficient and did a thorough service check.

Subscribed to most expensive three diamonds plan thinking that they will provide better support but nothing is happening for a week already. Contacted them several times and all I hear is we'll get back to you when we'll have understanding when engineer is available. Complete waste of money and time. Dont pay for their support but find someone else instead

A Defective Heat Pump and Weeks of No Help – Extremely Disappointed
I have had a Mitsubishi Ecodan R290 10 kW heat pump since early September. The unit does not come close to meeting Mitsubishi’s published performance specifications.
Actual performance vs Mitsubishi specification:
• COP at 35°C flow, 7°C external: 1.4 (spec 5.1)
• COP at 35°C flow, 2°C external: 1.2 (spec 3.24)
• Noise level at 1 m: 68 dB (spec 47 dB)
My energy bills have doubled and my home is cold. It has had a real impact on our comfort and our life.
What happened when I asked Mitsubishi for help?
Despite reporting the issue on 22 October, Mitsubishi repeatedly delayed, passed responsibility around, and failed to take ownership. Their communication has been slow, contradictory and at times obstructive:
• Technical support acknowledged a site visit was needed 10 November, yet Mitsubishi failed to schedule one, then required a “warranty claim number” that their own staff failed to issue.
• I repeatedly had to chase, re-explain the issue, and even agreed to pay for the visit upfront just to get progress.
• Forms were “lost”.
• After weeks, the request was marked “urgent”, but still no visit date.
• When the unit finally failed with an error code (P8), Mitsubishi still offered no practical assistance or timeframe.
I also submitted a formal complaint referencing their own ISO9001 obligations. No response.
Summary
• The heat pump supplied is defective and far outside its published specification.
• Mitsubishi’s after-sales support has been unresponsive, disorganised and extremely slow.
• We are left with a cold home and extremely high electricity bills.
I expected far better from a company of Mitsubishi’s reputation. Based on my experience—and seeing over 140 other one-star reviews with similar themes—I cannot recommend Mitsubishi Electric UK.

En tant qu'Artisan qui dépanne les PAC je suis très déçu de Mitsubishi "Electric" et leurs service "pourri" avec leurs clampins au téléphone, incapable d'expliquer comment fonctionne leurs site, commander un condo est devenu le parcours du combattant, des NULS !!

We expected far better from a company with Mitsubishi’s reputation.

Our Ecodan Air Source Heat Pump failed under warranty, and as of today, 19 November, we’ve been without heating and hot water for 28 days.

We’ve chased repeatedly and requested a call from a senior manager — yet no one has contacted us.
We’ve now been given a repair date, but based on previous failed appointments, we’re not confident they will attend.

For a brand of Mitsubishi’s size, leaving a household without essential heating and hot water for nearly a month is totally unacceptable.

Communication has been poor, inconsistent and insulting - We were advised to use the immersion heater, despite Mitsubishi already having a report saying it doesn’t work.

We hope someone finally takes responsibility and that tomorrow doesn’t become another missed appointment.

We unfortunately bought our home in 2020 with a Mitsubishi heating system already installed, and it has been nothing but problems from day one. If I could give zero stars, I would. This has easily been the worst service experience I’ve ever had with any company.

Every single year without fail, we have had at least one major breakdown where we’ve had to contact Mitsubishi. And every year, their customer support manages to be just as slow and unhelpful as the last time.

Last December, the system failed completely and we were left with no heating and no hot water for the entire month. In the middle of winter. Mitsubishi eventually admitted we needed an entirely new outside fan unit installed — which in itself took far too long. In the meantime, we were forced to use expensive electric heaters and had to constantly boost the hot water just to shower, which sent our electricity bills through the roof. None of that was reimbursed or even acknowledged by Mitsubishi.

This year, once again, the system has failed. We repeatedly get an L9 error code every time we attempt to use the heating. Mitsubishi sent an engineer out last Monday — and unbelievably, he made the situation worse. He clearly had no idea how the system worked. He spent almost the entire appointment on the phone to Mitsubishi asking what to do, and after he left, the heating stopped working altogether without producing the L9 error every time. So we are now worse off after their “service” than before.

Considering we pay £400 per year for their Diamond Cover, the service we receive is frankly shocking. Their own policy claims to offer priority support and reliable cover (the document is online for anyone to read), but in reality, it’s nothing but broken promises. We are constantly forced to chase them, the wait times are ridiculous, and the level of support we get is the total opposite of what they advertise.

Their communication is slow, vague and unhelpful. They leave you waiting for updates, they repeatedly fail to resolve guaranteed faults, and they’ll happily take your annual premium without delivering the service they promise. The whole experience has been unbelievably stressful and completely unacceptable.

We are now heading into cold weather again and, thanks to Mitsubishi, we currently have no working heating system, despite having paid hundreds of pounds a year for cover that’s supposed to prevent exactly this situation.

On top of all this, we’re now in a position where we have to buy Mitsubishi’s Diamond Cover every year because the system is so unreliable that we’d be completely screwed without it. It’s not something we choose — it’s something we’re forced into because the system breaks so often and the repairs required are so expensive that we wouldn’t be able to afford them. And the worst part? Even with Diamond Cover, we’re left chasing them constantly, sitting on long hold times, and dealing with broken promises. For £400 a year, you’d expect priority service, competence, or at the very least some urgency — but we get none of that. It honestly feels like we’re paying a premium just to be ignored slightly slower.

I would strongly advise anyone considering a Mitsubishi heating system — or their Diamond Cover — to think very carefully. Our experience since 2020 has been nothing but ongoing faults, delays, incompetence, and extra costs. Truly awful service.