A903 - Controller fault: Call Tech Service

What does A903 mean?

A fault has been detected in the controller. This error requires a qualified technician to investigate and resolve.

• Controller malfunction
• Internal electronic fault

Click steps to track your progress.

1. 1

   Confirm the unit is receiving adequate power.

2. 2

   Attempt to reset the controller by briefly disconnecting power.

3. 3

   Schedule a service appointment with a qualified technician.