Alarm Z1 5215 - Inlet temperature sensor TC0 fault

What does 5215 mean?

This alarm indicates a persistent failure of the heat carrier return sensor TC0. It is triggered after repeated warnings or continuous open/short circuit conditions for 15 minutes, combining conditions for warnings 5213 and 5214.

• See possible causes for alarm codes 5213 and 5214 (Loose connection, broken or shorted sensor/cable, defective installer module).

Click steps to track your progress.

1. 1

   Note the alarm code 5215.

2. 2

   Contact a qualified Bosch Heat Pump installer or service technician.

3. 3

   The technician will inspect the sensor's connections and wiring, and replace the sensor or installer module if needed.