Fujitsu mini split error code E:23

Common causes

• Units from different series or capacities paired together.
• An unsupported multi-split combination.

How to fix it yourself

Work through the checks below first; they resolve most cases. If they do not, the repair itself may need a technician.

1. Check the model numbers against Fujitsu's compatibility list.
2. Reset the system: switch the breaker (or the outdoor disconnect) off, wait a full five minutes so the boards fully discharge, then switch it back on and restart from the remote.

Switch off power at the breaker before opening either unit. Capacitors in the outdoor unit hold a charge for several minutes after power is cut.

When to call a technician

Installer correction.

Which Fujitsu units show E:23

This page applies to Fujitsu Halcyon, Halcyon XLTH and Airstage multi-zone units. Fujitsu's own documentation lists E:23 as "Indoor and outdoor unit combination error", the same definition used across the Fujitsu General it is built on. If your unit shows a code with a different shape (for example a four-character code, or a plain number), it is from a different table; use the lookup with your exact code.

Where Fujitsu shows this code

Units with a display show the code as E:xx (E:41). Wall units without one flash the Operation and Timer lamps: count the Operation flashes for the first digit and the Timer flashes for the second, so 4 Operation flashes then 1 Timer flash is E:41. A wired controller shows the code directly. 1x codes are communication faults, 2x are configuration and combination errors, 3x and 4x are indoor board, sensor and fan faults, 6x and 7x are outdoor board and sensor faults, 9x are compressor and fan faults, and Ax codes are temperature and pressure protections.

Other Fujitsu codes

Same part of the system as E:23:

All Fujitsu error codes

E:23 on other brands

The same characters do not always mean the same thing. Check the brand on your unit.

• Rheem E:23 Indoor and outdoor unit combination error