Live diagnostic reference

Every split, VRF & light-commercial error code,
decoded and fixable.

Search any fault code across 16 major brands — for residential split systems, light commercial units (ceiling cassette, ducted, floor-standing), and commercial VRF/VRV networks. Plain-language meaning, likely causes, and the fix.

0error codes indexed

0brands covered

3unit types — split, light commercial & VRF

E5_

DAIKIN · COMPRESSOR OVERLOAD

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Ceiling cassette, ducted, and floor-standing commercial units generally run on the same control electronics as their brand's residential split line, so the fault codes are shared — search by brand and code as usual under "Split & Light Commercial." Where a code is specific to larger 3-phase or floor-standing equipment, that's noted in the result.

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Manufacturer manuals & documentation

Official installation, operation, and service manuals for each brand covered on this site. Most link straight to the manufacturer's own manual portal; where a brand doesn't offer one, we link to ManualsLib, a well-established third-party manual archive — clearly marked below.

About Advance Inventic Solutions

Advance Inventic Solutions (AIS) built this reference so anyone dealing with a faulty air conditioner — homeowners, facility managers, or technicians in the field — can look up an error code and get a plain-language answer in seconds, instead of digging through a 200-page service manual.

The database is compiled from official manufacturer service documentation and cross-checked across sources where brands' own numbering is inconsistent, covering residential split systems, light commercial units (ceiling cassette, ducted, floor-standing), and commercial VRF/VRV networks.