P4 (5701) - Drain float switch contact failure

What does P4 (5701) mean?

The drain float switch, which prevents drain pan overflow in the Mitsubishi Electric PUMY Air Conditioner, has a contact failure, meaning it's not operating correctly. The system will stop operating.

• Faulty drain float switch
• Loose or damaged wiring connections to the float switch
• Debris interfering with the switch mechanism
• Sticky or corroded switch contacts

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 the drain float switch and its connections.