P4 🟡 Repair Required
Mitsubishi Error Code P4: Drain Sensor Error
⚠️ Your Mitsubishi HVAC system has detected a potential water leak and has shut down to prevent damage. Call a professional for repair.
How to Fix Mitsubishi Code P4
- Check for and clear any clogs in the condensate drain line
- Inspect the drain pan for signs of water buildup
- If water is present, call a professional HVAC technician
What Does Mitsubishi Error Code P4 Mean?
The P4 error code on your Mitsubishi HVAC system indicates a fault with the drain sensor. This sensor is responsible for detecting water buildup in the condensate pan. When it malfunctions, it can cause your system to shut down to prevent water damage. The most common causes for this error are a clogged drain line or a faulty sensor.
Common Causes of Mitsubishi Code P4
- Clogged condensate drain line
- Faulty drain sensor
- Incorrect sensor installation
- Water pressure issue
Applicable Mitsubishi Models
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Find a Licensed Tech Near You →Replacement Parts for Mitsubishi Mini-Split Code P4
Drain Sensor OEM: 53015-24000
Condensate Drain Line