Mitsubishi Electric Error Code P4
Drain sensor error
Error Code Summary
| Brand | Mitsubishi Electric |
| Error Code | P4 |
| Meaning | Drain sensor error |
| Cause | Float switch activated |
| Recommended Action | Clean condensate drain |
How to Fix Mitsubishi Electric Error P4
- 1
Power Cycle the Unit
Turn off the unit at the breaker, wait 5 minutes, then restore power. Some errors auto-clear after a restart.
- 2
Identify the Issue
Error P4 means: Drain sensor error. The most common cause is: Float switch activated.
- 3
Take Corrective Action
Clean condensate drain
- 4
Test the System
After completing repairs, run the system and monitor for the error code. If it recurs, the issue may require professional diagnosis.
Safety Notice
Always disconnect power before performing any electrical work. If you're not a certified HVAC technician, contact a qualified professional for repairs involving refrigerant, electrical components, or compressor work.
Frequently Asked Questions
What does Mitsubishi Electric error code P4 mean?
Mitsubishi Electric error code P4 indicates: Drain sensor error. This is typically caused by: Float switch activated.
How do I fix Mitsubishi Electric error code P4?
To fix Mitsubishi Electric error code P4: Clean condensate drain. If the error persists after these steps, contact a qualified HVAC technician.
Is Mitsubishi Electric error code P4 serious?
Error code P4 (Drain sensor error) should be addressed promptly to prevent further damage to your Mitsubishi Electric system. Always turn off the unit if you notice unusual sounds, smells, or continued malfunction.