Fujitsu Error Code E6:00: Outdoor Coil Sensor Fault
How to Fix Fujitsu Code E6:00
- Step 1: Power cycle the unit by turning off the breaker for 5 minutes, then turn it back on. This may reset the system and clear a temporary error.
- Step 2: Visually inspect the outdoor unit for any obvious signs of damage to the wiring or sensor. Do not touch any components.
- Step 3: If the error persists after power cycling, contact a qualified HVAC technician for diagnosis and repair.
How to Reset Fujitsu Code E6:00
- 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.
Resetting clears the code from the display but does not fix the underlying fault. If the code returns after reset, proceed to the diagnostic steps above.
What Does Fujitsu Error Code E6:00 Mean?
The E6:00 error code on your Fujitsu mini-split system indicates a problem with the outdoor coil temperature sensor. This sensor is responsible for monitoring the temperature of the outdoor coil, which is vital for the system to operate efficiently and safely. The sensor provides feedback to the system's control board, allowing it to adjust refrigerant flow and fan speeds. If the sensor fails or provides incorrect readings, the system may not be able to heat or cool effectively, and in some cases, it can shut down completely to prevent damage. Essentially, the system isn't getting reliable temperature data from the outdoor coil. This could be due to a faulty sensor, wiring issues, or even a problem with the main control board. Because the system relies on this sensor for proper operation, it's important to address this issue promptly to restore your system's functionality and prevent further complications.
Common Causes
- Faulty outdoor coil temperature sensor
- Loose or corroded wiring connections to the sensor
- Wiring harness damage (rodent damage, cuts, etc.)
- Defective outdoor control board
Diagnostic Steps
| If... | Check | Expected |
|---|---|---|
| E6:00 error is present | Measure the resistance of the outdoor coil temperature sensor at the control board connector. Disconnect power first! | Resistance should match the temperature/resistance chart in the service manual. Common thermistors are 10k ohms @ 25C. |
| Sensor resistance is out of range | Inspect the wiring harness and connector for damage or corrosion. | Wiring and connector are intact and free from corrosion. |
| Wiring is good, resistance is still out of range | Replace the outdoor coil temperature sensor. | New sensor resolves the error. |
| Sensor tests good, wiring is good | Check the voltage at the sensor input on the outdoor control board. | Stable DC voltage, typically 5VDC. Consult the service manual for the exact voltage. |
Applicable Fujitsu Models
Replacement Parts
| Part | OEM Number | Est. Cost | Where to Buy |
|---|---|---|---|
| Outdoor Coil Temperature Sensor | 9316429017 | — | Find Part |
| Outdoor Control Board | — | — | — |
Related Codes on Same Models
Other codes that affect the same Fujitsu model families as E6:00.
| 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 |
| E3:00 | Room Temp Sensor Short Circuit | Warning |
| E4:00 | Indoor Coil Sensor Open | Warning |
| E5:00 | Indoor Coil Sensor Short | 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 |