Mitsubishi Mini Split Warranty Explained
(Full Coverage Guide 2026)
As an HVAC engineer, I’ve seen homeowners lose thousands of dollars simply because they didn’t understand how Mitsubishi’s warranty actually works.
The coverage is excellent — but only if the system is installed, registered, and maintained correctly. If you skip a step, that “12-year warranty” vanishes overnight.
When you invest in a premium Mitsubishi ductless system, you are paying for longevity. However, Mitsubishi operates with a strict, tiered warranty structure. Depending on who installs your system and how fast you register it, your compressor could be covered for 5 years… or 12 years. Let’s break down exactly what is covered in 2026 so you don’t void your protection.
What Is the Standard Mitsubishi Mini Split Warranty?
Mitsubishi does not have a “one-size-fits-all” warranty. It is broken down into three distinct tiers based on registration and the certification of your installer:
1. Base Warranty (Unregistered)
- Parts: 5 Years
- Compressor: 7 Years
- If you buy it and forget to register it online, this is all you get.
2. Extended Warranty (Registered)
- Parts: 10 Years
- Compressor: 10 Years
- Installed by a licensed state contractor and registered within 90 days.
3. Diamond Contractor Warranty
- Parts: 12 Years
- Compressor: 12 Years
- The absolute maximum coverage available in the industry.
Mitsubishi Diamond Contractor Warranty — Is It Worth It?
A Mitsubishi Diamond Contractor is an independent HVAC installation company that has completed rigorous factory training directly with Mitsubishi Electric.
If one of these certified technicians installs your system and registers it for you, your parts and compressor warranty automatically upgrades to 12 full years. But is it worth the higher installation quote?
Yes. Diamond Contractors charge a premium, but replacing a fried inverter compressor out-of-pocket can cost $1,500+. Read our Mitsubishi Mini Split Cost Breakdown to see exactly how much you should be paying for this level of installation.
What Voids a Mitsubishi Mini Split Warranty?
This is where homeowners get burned. Mitsubishi’s legal warranty document is strict. Doing any of the following will instantly void your coverage:
How to Register Your Mitsubishi Warranty
Do not rely on your contractor to do this. Take 10 minutes to protect your investment:
- Go to the official Mitsubishi Comfort product registration portal.
- Do this within 90 days of installation.
- You will need the Serial Number and Model Number for BOTH the indoor wall unit(s) and the outdoor compressor.
- You must provide your HVAC contractor’s name, license number, and installation date.
Is Mitsubishi’s Warranty Better Than Daikin?
It is a tie, but they use different terminology.
Daikin offers a 12-year parts and compressor warranty if the system is installed by a “Daikin Comfort Pro” (their equivalent of a Diamond Contractor). Both are spectacular.
For a full engineering breakdown of the two brands, read our Daikin vs Mitsubishi Engineering Comparison, or our dedicated Daikin Mini Split Review.
Real Case Example: Why Certification Matters
Case Study 1: The Budget Install
- Scenario: Compressor failed after 7 years.
- Installer: “A guy from Craigslist” (Non-certified).
- Registration: Never completed.
- The Result: Mitsubishi only honored the base 7-year compressor warranty. Because it wasn’t registered, the parts warranty had already expired at year 5. The homeowner paid $1,200 out of pocket for labor and refrigerant.
Case Study 2: The Diamond Install
- Scenario: Inverter board failed after 9 years.
- Installer: Certified Diamond Contractor.
- Registration: Done on day 1.
- The Result: The $600 PC board was fully covered under the 12-year parts warranty. The homeowner only paid a small diagnostic/labor fee to the contractor.
How Long Do Mitsubishi Mini Splits Actually Last?
With proper maintenance, an average Mitsubishi mini split will easily last 15 to 20 years. To reach that 20-year mark, you must:
- Clean the indoor filters monthly.
- Keep the outdoor condenser free of snow, leaves, and debris.
- Install a dedicated surge protector to shield the sensitive inverter boards from lightning and grid spikes. (Surge Protector Guide)
Is Mitsubishi Worth It for Rental Properties?
Yes. The 12-year parts warranty effectively guarantees that landlords won’t be buying major replacement parts for over a decade, drastically increasing your ROI. Read our full guide to the Best Mini Split for Rental Properties.
Frequently Asked Questions
How long is a Mitsubishi mini split warranty?
The standard unregistered warranty is 5 years for parts and 7 years for the compressor. If registered within 90 days, it extends to 10 years. If installed by a Diamond Contractor and registered, it extends to a maximum of 12 years for both parts and compressor.
Does the Mitsubishi warranty cover labor?
No. The standard Mitsubishi manufacturer warranty covers the cost of replacement parts and the compressor only. It does not cover the HVAC technician’s labor rate to diagnose or replace the part, unless your specific contractor offers their own separate labor guarantee.
Do I need to register my Mitsubishi warranty?
Yes. If you fail to register your system online within 90 days of installation, your warranty defaults to the lowest base tier (5 years parts / 7 years compressor), causing you to lose up to 5 years of potential coverage.
Does a DIY installation void the Mitsubishi warranty?
Yes. Mitsubishi explicitly requires their systems to be installed by licensed HVAC professionals with proper EPA certifications. Installing it yourself will void the warranty entirely.
Is the Mitsubishi warranty transferable?
Typically, the extended 10-year or 12-year warranties apply only to the original registered owner of the home. If you sell your house, the warranty usually reverts to the base 5-year parts/7-year compressor warranty for the new owners, calculated from the original install date.
