Fujitsu Error Code E3:00: Room Temp Sensor Short Circuit
How to Fix Fujitsu Code E3:00
- Step 1: Power cycle the unit by turning it off at the breaker for 5 minutes, then turn it back on. This may reset a temporary glitch.
- Step 2: Visually inspect the area around the indoor unit for any signs of obvious damage to the unit casing or any exposed wiring.
- Step 3: If the error persists after power cycling, contact a qualified HVAC technician to diagnose and repair the issue.
How to Reset Fujitsu Code E3:00
- Turn off the unit using the remote control or wall controller.
- Turn off the circuit breaker for the outdoor and indoor units. Wait 60 seconds.
- Restore power at the breaker.
- Turn the unit on with the remote control. If the error returns, the fault needs professional diagnosis.
What does E3:00 mean?
The E3:00 error code on your Fujitsu mini-split indicates a problem with the room temperature sensor. This sensor is responsible for accurately measuring the temperature in your room and communicating that information back to the unit's control board. The control board uses this data to regulate heating and cooling output. A 'short circuit' means there's an unintended electrical connection, likely caused by damaged wiring or a faulty sensor.
Because the system can't reliably read the room temperature, it shuts down to prevent potential problems like overheating or inefficient operation. This isn't a dangerous situation like a gas leak, but it does mean your mini-split won't work until the problem is fixed. It's important to address this promptly to restore your heating or cooling.
Affected Models
Replacement Parts
| Part | OEM Number | Est. Cost |
|---|---|---|
| Room Temperature Sensor | — | — |
| Control Board | — | — |
| Wiring Harness | — | — |
Related Codes on Same Models
| Code | Description | Severity |
|---|---|---|
| E0:00 | Communication Error (Indoor to Remote) | Warning |
| E1:00 | Communication Error (Indoor to Outdoor) | Warning |
| E2:00 | Room Temp Sensor Open Circuit | Warning |
| E4:00 | Indoor Coil Sensor Open | Warning |
| E5:00 | Indoor Coil Sensor Short | Warning |
| E6:00 | Outdoor Coil Sensor Fault | Warning |
| E7:00 | Outdoor Ambient Sensor Fault | Warning |
| E8:00 | Indoor Fan Motor Fault | Warning |
| E9:00 | Drain Pump / Float Switch | Warning |
| EE:00 | Communication Error (Multi-System) | Warning |