Alarm External heater EM is not operational — External heater fault or tripped fuse

What does 5272 mean?

This alarm indicates a problem with the external additional heater or its overheating protector, specifically if 230 V is detected on terminal 64 on the installer module.

• Tripped fuse at the distribution box.
• Potential causes similar to alarm 5246 (e.g., low system pressure, bad circulation).

Click steps to track your progress.

1. 1

   Check your electrical distribution box and reset any tripped fuses.

2. 2

   Review system pressure and circulation as outlined for troubleshooting alarm 5246.

3. 3

   If the alarm persists, contact a qualified technician for further diagnosis related to the external heater.