VRF Error Codes Explained.
Look up your error code below. We'll tell you what it means, how serious it is, and what to do next. If you need a tech, we dispatch same day for VRF systems across NYC.
22 error codes
Remote controller communication error
Check wiring between remote controller and indoor unit. Reset power. If persists, call a tech.
Indoor/outdoor unit communication error
Check communication wiring. Verify address settings. Reset system power for 30 seconds.
Remote controller signal receive error
Check for interference. Replace remote batteries. Re-pair if wireless.
Indoor unit communication error (inter-unit)
Communication fault between indoor units. Check transmission line. Requires technician.
Outdoor unit communication error (inter-unit)
Communication between outdoor units failed. Check wiring and PCB. Call for service.
Communication error (between indoor and M-NET)
M-NET controller issue. Verify address and wiring. May need board replacement.
Communication error (between M-NET controllers)
Cascaded controller communication failure. Check all M-NET wiring and terminators.
High pressure protection activated
System shut down on high head pressure. Check for dirty condenser coil, blocked airflow, or refrigerant overcharge. Call for service.
Low pressure protection / refrigerant shortage
Possible refrigerant leak. System needs professional leak detection and repair. Do not reset repeatedly.
Compressor overcurrent trip
Compressor drawing too much current. Could be failing compressor, wiring issue, or locked rotor. Requires technician.
Thermistor fault (discharge pipe)
Discharge pipe temperature sensor open or short. Sensor replacement needed.
Thermistor fault (condenser)
Condenser temperature sensor failure. Check connections. May need sensor replacement.
Compressor overcurrent (during start)
Compressor cannot start. Check power supply voltage, wiring, and compressor condition.
Outdoor unit fan motor fault
Fan motor stopped or running erratically. Check motor, capacitor, and control board.
Abnormal voltage detection
Power supply voltage out of range. Check building power. May need electrician + HVAC tech.
High pressure protection (heat mode)
Indoor coil too hot in heating mode. Check for restricted airflow or dirty filters.
Indoor unit fan motor error
Fan motor stopped. Check motor connections. Clean fan wheel. May need motor replacement.
Intake sensor error
Room temperature sensor fault. Check connector. Replace sensor if damaged.
Pipe temperature sensor (indoor heat exchanger)
Coil temperature sensor fault. Sensor may need replacement.
Drain sensor error / float switch activated
Condensate drain blocked or float switch tripped. Clear the drain line.
Drain pump error
Condensate pump failed. Check pump operation and wiring. May need pump replacement.
Pipe temperature error (2nd heat exchanger)
Sub-cool sensor fault. Check sensor and connections.
Got a VRF error code?
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