Coffee machine displays message "AIR BUBBLE ALARM"

Issue

• Coffee machine displays the message "AIR BUBBLE ALARM"

Applies to

• Built-in coffee machine with a display and rotary knob

Resolution

1. Press OK to deliver water from the spout until it flows out normally. Delivery stops automatically. 
2. If the problem persists, make sure the water tank is fully inserted.

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For AEG coffee machine initial setup, troubleshooting guide and cleaning recommendations see our coffee machine Q&A

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Cause

• The water circuit is empty
• Water tank not fully inserted