p5
Moderate
Mitsubishi Electric · Mini-Splits & Ductless Systems
Drain Pump Fault
Quick Answer
Error code P5 on your Mitsubishi Electric Mini-Splits & Ductless Systems means: Drain Pump Fault. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
Likely Causes
How to Fix It
1
Check if the condensate pump is receiving power by listening for motor operation
2
Clean the pump reservoir and impeller of any debris or algae buildup
3
Test the pump float switch by manually lifting it to trigger pump operation
4
Verify the pump discharge line is not kinked or blocked
5
Replace the condensate pump if the motor does not run when the float is triggered
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
Condensate pump
Pump tubing
Pump cleaning solution
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