About this database

The tool itself lives at the mini split error code lookup; every brand's full list is under error codes by brand.

DIY HVAC Tools exists for one moment: you are standing in front of a mini split that has stopped, there are two characters on the display, and you want to know whether it is a loose wire or a dead compressor before you call anyone.

Where the codes come from

Every code list is transcribed from the manufacturer's own service manual or owner's manual for that brand, then cross-checked against the platform it is built on. Pioneer, MRCOOL and Senville, for example, are all built on the Midea residential inverter platform, so their manuals reproduce the same table; where a brand's manual differs from the platform, the brand's manual wins on that brand's pages.

The troubleshooting steps are written for a homeowner with a screwdriver, a flashlight and maybe a multimeter. They stop where the sealed refrigerant circuit or high-voltage inverter work begins, because that is where the EPA and your safety say they should.

What this site is not

It is not affiliated with, endorsed by, or connected to any manufacturer listed. Brand names belong to their owners and appear here to identify which units a code applies to. The site does not sell parts or service.

Corrections

Codes change between model years, and manuals contain typos of their own. If your manual disagrees with a page here, your manual is right. If you spot an error, the fastest fix is to tell us which brand, which code, and what your manual says, along with the model number on the indoor unit's label.

A contact address for corrections is being set up. Until then, the brand's own manual table is the source of truth.