Fujitsu Error Code E1:00: Communication Error (Indoor to Outdoor)
How to Fix Fujitsu Code E1:00
- Step 1: Check the power to both the indoor and outdoor units. Make sure both are turned on and receiving power.
- Step 2: Inspect the wiring connections at the outdoor unit disconnect. Ensure the wires are securely connected. (Note: Only inspect, do not touch any wires.)
- Step 3: If the problem persists, contact a qualified HVAC technician to diagnose and repair the communication issue.
How to Reset Fujitsu Code E1:00
- 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 E1:00 mean?
The E1:00 error code on your Fujitsu mini-split indicates a communication problem between the indoor unit and the outdoor unit. Essentially, the two units aren't talking to each other properly. This prevents the system from operating because the indoor unit can't tell the outdoor unit what to do (like turn on the compressor or adjust fan speed), and the outdoor unit can't report its status back to the indoor unit.
This communication issue can stem from several things, ranging from simple wiring problems to more complex failures in the control boards of either the indoor or outdoor unit. Because mini-splits rely on constant communication to modulate their output and maintain efficient operation, this error will lock out the system until the problem is resolved. It's important to address this promptly to avoid further potential damage to the system components.
Affected Models
Replacement Parts
| Part | OEM Number | Est. Cost |
|---|---|---|
| Indoor Unit Control Board | — | — |
| Outdoor Unit Control Board | — | — |
| Communication Wire | — | — |
Related Codes on Same Models
| Code | Description | Severity |
|---|---|---|
| E0:00 | Communication Error (Indoor to Remote) | 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 |
| 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 |