Fujitsu Error Code E2:00: Room Temp Sensor Open Circuit
Warning: The indoor unit isn't reading the room temperature, so the system has shut down to prevent overheating or freezing. This requires professional diagnosis.
How to Fix Fujitsu Code E2:00
- Step 1: Power cycle the unit by turning off the breaker that supplies power to the indoor unit for 5 minutes, then turn it back on. This may reset the system and clear a temporary error.
- Step 2: Visually inspect the area around the indoor unit for any obvious signs of damage, such as chewed wires or loose connections. Do not open the unit.
- Step 3: If the error persists after power cycling and you see no obvious damage, contact a qualified HVAC technician to diagnose and repair the issue.
How to Reset Fujitsu Code E2:00
- 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 E2:00 mean?
The Fujitsu error code E2:00 indicates that the indoor unit's main control board isn't receiving a signal from the room temperature sensor. This sensor, also called a thermistor, is responsible for telling the system the current room temperature. Without this information, the unit can't properly regulate heating or cooling, and the system will lock out to prevent potential issues like the unit running constantly or not at all. This error is specific to the indoor unit and will prevent it from operating until the issue is resolved. It's important to address this promptly to restore comfortable temperatures and efficient operation.
Affected Models
Replacement Parts
| Part | OEM Number | Est. Cost |
|---|---|---|
| Room Temperature Sensor (Thermistor) | 9704378071 | — |
| Main Control Board | — | — |
Related Codes on Same Models
| Code | Description | Severity |
|---|---|---|
| E0:00 | Communication Error (Indoor to Remote) | Warning |
| E1:00 | Communication Error (Indoor to Outdoor) | 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 |