Mitsubishi Error Code 5: Outdoor Thermistor Open/Short
Warning: Your Mitsubishi HVAC system has detected an issue with the outdoor thermistor and has shut down to prevent damage.
How to Fix Mitsubishi Code 5
- Check for any visible damage to the outdoor unit and the wiring
- If the issue persists, contact a professional HVAC technician for a thorough diagnosis and repair
How to Reset Mitsubishi Code 5
- 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 5 mean?
The Mitsubishi 5 error, also known as an 'Outdoor Thermistor Open/Short', indicates that your system has detected an issue with the outdoor thermistor. This component is responsible for measuring the temperature outside your home and communicating this information to your HVAC system. If the system detects that the thermistor is not functioning properly, it will shut down to prevent further damage. This error is typically caused by a faulty thermistor, but it could also be due to a problem with the wiring or the control board.
Affected Models
Replacement Parts
| Part | OEM Number | Est. Cost |
|---|---|---|
| Outdoor Thermistor | 530-243-001 | — |
Related Codes on Same Models
| Code | Description | Severity |
|---|---|---|
| 1 | Indoor/Outdoor Mismatch | Warning |
| 2 | Power Supply Phase Error | Warning |
| 3 | Communication Error | Warning |
| 4 | Inverter Error | Warning |
| 6 | Indoor Freeze/Overheat | Warning |
| 7 | Outdoor Freeze/Overheat | Warning |
| E6 | Indoor/Outdoor Communication Error | Warning |
| E9 | Indoor/Outdoor Communication Fault | Warning |
| P1 | Intake Sensor Error | Warning |
| P2 | Indoor Pipe Thermistor Error | Warning |