Error ER1 — Internal fault detected

What does ER1 mean?

Your Mitsubishi Electric MSZ-AY Air Conditioner displays error code ER1, indicating that an internal fault has been detected within the system, which could affect its ability to operate correctly.

• An internal component has malfunctioned.
• Overload or abnormal operating condition.
• System requires a reset to clear the error state.

Click steps to track your progress.

1. 1

   Power off the air conditioner using the remote control.

2. 2

   Disconnect the main power to the air conditioner at the circuit breaker for at least 30 seconds.

3. 3

   Reapply power and attempt to power on the air conditioner to see if the fault persists.