u5
Moderate
Mitsubishi Electric · Mini-Splits & Ductless Systems
Condenser Temperature Abnormal
Quick Answer
Error code U5 on your Mitsubishi Electric Mini-Splits & Ductless Systems means: Condenser Temperature Abnormal. This is usually fixable — see the step-by-step guide below.
Likely Causes
How to Fix It
1
Clean the outdoor condenser coil thoroughly
2
Verify the condenser coil thermistor reading matches an independent temperature measurement
3
Check the outdoor fan motor for proper operation at all speed settings
4
Connect gauges and verify refrigerant charge by checking superheat and subcooling
5
A licensed HVAC technician should evaluate if the charge or metering device is causing the temperature anomaly
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
Condenser coil thermistor
Outdoor fan motor
Refrigerant (R-410A)
Coil cleaner
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