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TheAChub
Code Text Description Cause Check Procedure Technical Support Notes 2503 Drain sensor fault The drain sensor is open/short circuit. If the drip tray is clear then check the resistance of the drain sensor as an open circuit or short circuit can cause the fault. Check the wiring diagram to see if the indoor unit has a float switch or sensor. If the wiring diagram shows a float switch and not a sensor check the dip switch settings for the unit model you are working on.
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