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Mitsubishi Electric Error Codes & Troubleshooting

Complete error code database and troubleshooting guide for Mitsubishi Electric systems. Find solutions to common issues or contact our experts.

Emergency: 0405 133 761

Mitsubishi Electric Error Codes

Complete error code reference for Mitsubishi Electric systems. Each error code includes severity level, description, and troubleshooting steps.

P1
HIGH
Indoor PCB Error

Indoor control board malfunction

Power cycle units together. Wait 5 minutes.

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P2
HIGH
Outdoor PCB Error

Outdoor compressor board fault

Check power supply. Inspect control cable.

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P3
HIGH
Temperature Sensor Fault

Indoor/outdoor temperature sensor error

Clean sensor. Power cycle. Contact service if continues.

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P4
HIGH
Indoor Fan Motor Error

Indoor blower malfunction

Clean filters. Verify power. Check connectors.

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P5
HIGH
Outdoor Fan Motor Error

Outdoor fan not running

Check for ice/debris. Clean fan area.

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P6
URGENT
Refrigerant Pressure Low

Critical refrigerant loss

Professional evacuation and recharge needed.

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P7
URGENT
High Discharge Pressure

Compressor pressure exceeds limits

Shut down. Check condenser fan and coil.

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P8
HIGH
Compressor Overload

Compressor protection activated

Allow 30 min cooling. Check airflow.

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P9
URGENT
Incorrect Refrigerant

Wrong refrigerant type detected

Professional evacuation and correct recharge.

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P10
HIGH
Discharge Temp High

Compressor outlet temp excessive

Verify outdoor airflow. Clean condenser.

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P11
MEDIUM
Remote Control Error

Remote signal not received

Replace batteries. Point at unit. Check sensor.

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P12
MEDIUM
Defrost Malfunction

Heating defrost not working

Check outdoor coil ice. Manual defrost may help.

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P13
LOW
Mode Mismatch

Wrong mode selected

Set thermostat to correct mode (COOL/HEAT).

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P14
MEDIUM
Indoor Filter Dirty

Air filter needs attention

Clean mesh or replace disposable filter.

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P15
MEDIUM
Outdoor Coil Iced

Ice accumulation on outdoor coil

Run defrost or switch to COOL.

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P16
HIGH
Power Supply Error

Voltage instability

Check breaker. Verify dedicated circuit.

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P17
HIGH
Expansion Valve Issue

TXV malfunction

Refrigeration service required immediately.

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P18
HIGH
Water Leaking

Condensate drain blocked

Clean drain line. Check outdoor placement.

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P19
MEDIUM
Outdoor Unit Noise

Unusual sounds from outdoor unit

Check components. Professional inspection recommended.

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P20
URGENT
Communication Failure

Units cannot communicate

Check control cable. Reset system completely.

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Preventative Care

Mitsubishi Electric Maintenance Tips

Regular maintenance helps prevent error codes and keeps your system running efficiently. Follow these Mitsubishi Electric-specific tips for optimal performance.

Still Need Help?

Our licensed technicians specialize in Mitsubishi Electric systems and are available 24/7 for emergency repairs and expert support.

Call Now: 0405 133 761Book Service

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0405 133 761
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