Mitsubishi Error Code 5: Outdoor Thermistor Open/Short
LED Blink Pattern
LED blinks 5 times.
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.
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 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.
Common Causes
- Faulty outdoor thermistor
- Damaged wiring to the thermistor
- Issues with the control board
Diagnostic Steps
| If... | Check | Expected |
|---|---|---|
| The outdoor unit is not running | Measure the resistance of the thermistor using a multimeter | Resistance should be within the manufacturer's specified range for the current temperature |
| The thermistor resistance is out of range | Inspect the wiring to the thermistor for any damage or breaks | Wiring should be intact and free of damage |
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 |
|---|---|---|---|
| Outdoor Thermistor | 530-243-001 | — | Find Part |
Related Codes on Same Models
Other codes that affect the same Mitsubishi model families as 5.
| 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 |