Daikin Mini-Split Not Working: Complete Diagnosis Guide
Quick Answer
When a Daikin mini-split is completely not working - no display, no fan, no response to the remote - the issue is almost always power-related. Daikin mini-splits receive power at the outdoor unit first, then feed power to the indoor unit through the communication cable. If the outdoor unit breaker has tripped, both units lose power.
When a Daikin mini-split is completely not working - no display, no fan, no response to the remote - the issue is almost always power-related. Daikin mini-splits receive power at the outdoor unit first, then feed power to the indoor unit through the communication cable. If the outdoor unit breaker has tripped, both units lose power. Check the outdoor unit breaker separately from any indoor breaker. If power is confirmed at both units but neither responds, the outdoor unit control board may have failed catastrophically - on Daikin systems, the outdoor board is the master controller and must be operational for the indoor unit to function.
What Does the NOT-WORKING Code Mean?
Check outdoor unit breaker first - Daikin indoor units receive power through the outdoor unit. If breaker is on, check for error codes. If no display at all, the outdoor control board may have failed.
Most Likely Causes
Based on aggregated repair data, here is the probability breakdown for this error code:
Symptoms You May Notice
- No display on indoor unit
- No response to remote control
- No sound from either unit
- Outdoor unit completely silent
- No LED indicators on either unit
Can you reset a Daikin minisplit to clear the NOT-WORKING code?
Breaker off 30 seconds, on, wait 3 full minutes. Try emergency operation button on indoor unit if remote does not work.
Tools Required for Diagnosis
Diagnostic Checklist
Follow these steps in order. We start with the easiest external fixes before opening up the machine.
Check the circuit breaker for the mini-split at your electrical panel
Check the circuit breaker for the mini-split at your electrical panel. Also check if there is a separate disconnect box near the outdoor unit. Reset any tripped breakers by turning fully off then on.
At the outdoor unit
Try the emergency operation button on the indoor unit
Replacement Parts
If your diagnostic testing proves the component has failed, you will need a replacement. We recommend OEM parts over aftermarket for water-handling components.
| Part Name | OEM Number | Estimated Price |
|---|---|---|
| Daikin Outdoor Control BoardModel-specific · $200–$500 | Model-specific | $200 – $500 |
| Daikin Remote ControlBRC4C65 · $30–$60 | BRC4C65 | $30 – $60 |
| Board fuse (outdoor unit)Various · $2–$5 | Various | $2 – $5 |
Repair vs. Replace Calculator
Frequently Asked Questions
Can a power surge kill my Daikin mini-split?
Is there a fuse inside the Daikin outdoor unit?
Both my indoor and outdoor units are dead. Is the whole system broken?
Related Daikin Minisplit Error Codes
Models Known to Experience NOT-WORKING Errors
This repair applies to most Daikin minisplits with this error code. Common model numbers include:
FTXS09LVJU, FTXS12LVJU, FTXM15QVJU, FTXM18QVJU, FTXM24QVJU
Last verified for technical accuracy on March 15, 2026