Mitsubishi Error Code U5: Abnormal Condenser Temp
Warning: Your Mitsubishi HVAC system has detected an abnormal condenser temperature, which could lead to system damage if not addressed.
LED Blink Pattern
How to Fix Mitsubishi Code U5
- Check and clean the outdoor unit if accessible and safe to do so.
- If the outdoor unit is dirty, turn off the system and contact a professional HVAC technician.
- If you suspect low refrigerant levels, turn off the system immediately and contact a professional.
How to Reset Mitsubishi Code U5
- 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 Mitsubishi Error Code U5 Mean?
The U5 error code on your Mitsubishi HVAC system indicates that the condenser temperature is higher than normal. This could be due to a few reasons, such as a dirty condenser coil, a faulty temperature sensor, or a problem with the refrigerant system. It's important to address this issue promptly to prevent further damage to your system.
Common Causes
- Dirty condenser coil
- Faulty temperature sensor
- Low refrigerant levels
Diagnostic Steps
| If... | Check | Expected |
|---|---|---|
| The outdoor unit is running but not cooling | Measure the temperature at the suction line | Below 60°F (15.5°C) for cooling mode |
| The outdoor unit is running but not heating | Measure the temperature at the liquid line | Above 100°F (37.8°C) for heating mode |
Applicable Mitsubishi Models
- City Multi (VRF)(electric)
- City Multi (Y)(electric)
- Diamond (PJ)(electric)
- Diamond Plus(electric)
- Diamond Series(electric)
- Ducted Systems(electric)
- M-Series(electric)
- MSZ(electric)
- MSZ Series(electric)
- MSZ-AP(electric)
- MSZ-AP Series(electric)
- MSZ-AP5 Series(electric)
- MSZ-AS(electric)
- MSZ-FD(electric)
- MSZ-FE(electric)
- MSZ-FS(electric)
- MSZ-FS/FD Series(electric)
- MSZ-FT(electric)
- MSZ-FY(electric)
- MSZ-GE(electric)
- MSZ-LV(electric)
- MUZ-FE Series(electric)
- P-Series(electric)
- PUMA(electric)
- PUMY(electric)
- Puff (P-Series)(electric)
Replacement Parts
| Part | OEM Number | Est. Cost | Where to Buy |
|---|---|---|---|
| Condenser coil | — | — | — |
| Temperature sensor | — | — | — |
| Refrigerant | — | — | — |
Related Codes on Same Models
Other codes that affect the same Mitsubishi model families as U5.
| Code | Description | Severity |
|---|---|---|
| 1 | Indoor/Outdoor Mismatch | Warning |
| 2 | Power Supply Phase Error | Warning |
| 4 | Inverter Error | Warning |
| 7 | Outdoor Freeze/Overheat | Warning |
| E6 | Indoor/Outdoor Communication Error | Warning |
| E9 | Indoor/Outdoor Communication Fault | Warning |
| P2 | Indoor Pipe Thermistor Error | Warning |
| P4 | Drain Sensor Error | Warning |
| P6 | Coil Freeze/Overheat Protection | Warning |
| U2 | Low Voltage/Overcurrent | Warning |