P4 (2503) - Drain sensor trouble

What does P4 (2503) mean?

An issue has been detected with the drain sensor, which monitors the water level in the drain pan of the Mitsubishi Electric PUMY Air Conditioner. This could be a fault with the sensor itself or its connection.

• Faulty drain sensor
• Loose or damaged wiring connection to the drain sensor
• Accumulation of debris on the sensor affecting its reading

Click steps to track your progress.

1. 1

   Note the error code displayed on the remote controller or outdoor unit.

2. 2

   Power off the Mitsubishi Electric PUMY Air Conditioner system at the main electrical breaker.

3. 3

   Wait for at least 30 seconds, then restore power to the system.

4. 4

   If the error persists, contact a qualified service technician to inspect or replace the drain sensor and its wiring.