Error Code: EH bA – Communication Malfunction Between Indoor Unit and External Fan Module

Error Code: EH bA – Communication Malfunction Between Indoor Unit and External Fan Module

What this means:
The indoor unit has not received any feedback from the external fan module for 150 seconds. Alternatively, it may have received abnormal voltage signals (too high or too low) from the external fan module. This indicates a communication or feedback fault between the main PCB and the fan moduleTS35.

Try this first (quick reset):

1. Turn off the power supply completely.

2. Wait 2 minutes.

3. Turn the unit back on and check the display.

• If the error clears — the system may resume normal operation.

• If the error remains — continue with the steps below.

Next steps (for technicians):

1. Check ENC1 settings:

   • If the setting is incorrect → reset ENC1 to its default/factory setting.

2. If ENC1 is correct and fault persists:

   • Replace the indoor main PCB.

What you might need:

• Indoor main PCB

Helpful tip:
EH bA belongs to a group of errors tied to external fan module communication, alongside EH 3A and EH 3b. Always confirm ENC1 configuration before replacing hardware.

Click here to view the detailed guide.TS35