u2
Moderate
Mitsubishi Electric · Mini-Splits & Ductless Systems
Low Voltage / High Current Abnormality
Quick Answer
Error code U2 on your Mitsubishi Electric Mini-Splits & Ductless Systems means: Low Voltage / High Current Abnormality. This is usually fixable — see the step-by-step guide below.
Likely Causes
How to Fix It
1
Measure voltage at the outdoor unit disconnect under operating load conditions
2
Verify voltage stays within the unit's rated range (typically 187-253VAC for 230V models)
3
Check all terminal connections and the disconnect switch for tight connections
4
Verify the circuit wire gauge is adequate for the distance and amperage load
5
If voltage is consistently low, a licensed electrician should evaluate the electrical supply
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
Disconnect switch (if contacts are worn)
Electrical wire (correct gauge)
Wire connectors
Related Error Codes