Mitsubishi Air Conditioner Error Codes
| 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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