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. 1

    Perform diagnostic checks on the primary circuit board to assess the functionality of the integrated sensor.

  2. 2

    If the sensor is integrated into the PCB and unrepairable, the primary circuit board may require repair or replacement.

  3. 3

    Compare the sensor's readings with an external temperature probe if the sensor is accessible.

Browse all codes in this manual (61)
Verified technical data. Last updated: March 2026

Related Faults