Mitsubishi Error Code P5: Drain Pump Error

LED Blink Pattern

How to Fix Mitsubishi Code P5

1. Check the drain line for any visible blockages or kinks. If you find any, try to clear them gently using a wet/dry vacuum or a suitable plumbing snake.
2. Locate the drain pan and inspect it for any signs of water backup. If water is present, it may indicate a clogged drain line or a faulty pump.
3. If you're comfortable doing so, you can attempt to clean the drain pump and float switch using a suitable cleaning solution. However, if the pump or switch appears damaged, it's best to call a professional.

How to Reset Mitsubishi Code P5

1. Turn off the unit using the remote control or wall controller.
2. Turn off the circuit breaker for the outdoor and indoor units. Wait 60 seconds.
3. Restore power at the breaker.
4. Turn the unit on with the remote control. If the error returns, the fault needs professional diagnosis.

Resetting clears the code from the display but does not fix the underlying fault. If the code returns after reset, proceed to the diagnostic steps above.

What Does Mitsubishi Error Code P5 Mean?

The P5 error on your Mitsubishi HVAC system indicates that the drain pump, responsible for removing condensed water, is not functioning correctly. This could be due to a clogged drain line, a faulty pump, or an issue with the float switch that senses water levels. The system will continue to operate, but water may back up and cause damage or reduce cooling efficiency. It's important to address this issue promptly to prevent potential water damage or reduced comfort.

Common Causes

• Clogged drain line due to dirt, debris, or mold growth
• Faulty drain pump
• Malfunctioning float switch

Diagnostic Steps

Replacement Parts

Related Codes on Same Models

Other codes that affect the same Mitsubishi model families as P5.