502
Temperature Sensor PCB Defective
Fronius · Perfect Charging
What does 502 mean?
The temperature sensor located directly on the main primary circuit board (PCB) is detected as defective. This indicates a fault with a critical integrated sensor responsible for monitoring the temperature of the primary circuit board itself.
Common Causes
- Internal failure of the PCB-mounted temperature sensor component.
- Damage to the primary circuit board in the vicinity of the sensor.
- A calibration issue with the integrated sensor, leading to incorrect readings.
Repair Steps & Checklist
Click steps to track your progress.
- 1
Perform diagnostic checks on the primary circuit board to assess the functionality of the integrated sensor.
- 2
If the sensor is integrated into the PCB and unrepairable, the primary circuit board may require repair or replacement.
- 3
Compare the sensor's readings with an external temperature probe if the sensor is accessible.
Verified technical data. Last updated: March 2026
Related Faults
Source: Fronius Perfect Charging