E1 n 30 (FJM Indoor) — Heat exchanger in & out temperature sensor detached

What does E1 n 30 mean?

The FJM indoor unit displays E1 n 30, indicating that both the heat exchanger 'in' and 'out' temperature sensors are detected as detached or disconnected. This is a critical error for indoor coil temperature monitoring.

• Loose connections for both 'in' and 'out' sensors
• Wiring issue affecting both sensor circuits

Click steps to track your progress.

1. 1

   Turn off the power to the FJM indoor unit at the circuit breaker.

2. 2

   Locate both the heat exchanger 'in' and 'out' sensors on the indoor coil.

3. 3

   Ensure both sensors are firmly connected and properly seated in their positions.

4. 4

   Restore power and check if the error clears. If not, contact a qualified technician.