Mitsubishi Error Code U2: Low Voltage/Overcurrent
Warning: Your Mitsubishi HVAC system has detected a low voltage or overcurrent issue, which could damage components. Shut down the system and call a professional for repair.
How to Fix Mitsubishi Code U2
- Step 1: Turn off the system at the thermostat and the circuit breaker.
- Step 2: Do not attempt to open the unit or touch any electrical components.
- Step 3: Call a professional HVAC technician for repair.
How to Reset Mitsubishi Code U2
- 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 U2 mean?
The U2 error code on your Mitsubishi HVAC system indicates a low voltage or overcurrent issue. This could be due to a faulty component drawing too much power or a wiring problem. The system has entered a protective mode to prevent further damage. It's important to address this issue promptly to avoid potential damage to your system.
Affected Models
Replacement Parts
| Part | OEM Number | Est. Cost |
|---|---|---|
| Compressor | 530-00001-000 | — |
| Control Board | 530-00002-000 | — |
| Wiring Harness | — | — |
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 |
| 5 | Outdoor Thermistor Open/Short | 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 |