26 - Indoor unit address setting error.
Fujitsu General's official error table labels code 26 as an indoor unit address setting error, pointing to an addressing mismatch in system setup.
Family context is taken from Fujitsu General's floor-mounted split-system product pages. Error-code mappings below are conservatively taken from an official Fujitsu General installation-manual error table for a floor-mounted indoor unit, so exact display behavior and applicability can vary by controller and connected system type.
Severity
High
Display
Shown in the official error table as an indoor-unit error display condition during operation.
Support first?
Often not
Models in range
AGU9RLF, AGU12RLF, AGU15RLF
What to do first
Start with these checks
- 1Record the code and affected unit
- 2Restart the system once only
- 3Request service for address-setting verification if the code remains
Likely causes
What usually sits behind this code
Indoor-unit address setting is incorrect
Address duplication or mismatch in a connected system
Commissioning or board-setting problem
Contact support
Contact customer support if any of these apply
- !The code persists after restart
- !You have a multi-unit installation
- !The unit cannot be selected or controlled correctly
- - The official wording does not provide a user repair path beyond identifying the fault.
- - Address-setting faults typically require installer or technician access.
Related codes
Nearby codes in this family
Source notes
Source and scope
Source: Fujitsu General installation manual
Official error-code table snippet for a Fujitsu General floor-mounted indoor unit lists code 26 as Indoor unit address setting error.
Last reviewed: 2026-04-19
Use this as an official-first pointer, not a repair authorization. Exact troubleshooting steps and code visibility vary by model, controller, and system configuration.