If you're looking for help fixing your Napoleon Air Conditioner, look no further! Our comprehensive Napoleon Air Conditioner error code guide will explain common issues, provide tips, and show you how to read your model's error codes.

CODE: Unit will not operate, 
PROBLEM: Power disconnected or loose connection. 
FIX: Check power supply to unit. Check voltage at contactor. 

CODE: Unit will not operate, 
PROBLEM: Blown fuse / breaker tripped. 
FIX: Replace fuses/reset breaker. 

CODE: Unit will not operate, 
PROBLEM: Thermostat out of calibration is set too high. 
FIX: Reset. 

CODE: Unit will not operate, 
PROBLEM: Contactor defective. 
FIX: Check for 24VAC at contactor coil - replace if open. 

CODE: Unit will not operate, 
PROBLEM: Transformer defective. 
FIX: Check wiring - replace transformer. 

CODE: Unit will not operate, 
PROBLEM: High pressure control open (if provided). 
FIX: Reset - see high pressure connection. 

CODE: Outdoor fan on; Compressor off. 
PROBLEM: Run or start capacitor defective. 
FIX: Replace. 

CODE: Outdoor fan on; Compressor off. 
PROBLEM: Start relay defective. 
FIX: Replace. 

CODE: Outdoor fan on; Compressor off. 
PROBLEM: Loose wire. 
FIX: Check for correct voltage at compressor - check and tighten all connections. 

CODE: Outdoor fan on; Compressor off. 
PROBLEM: Compressor stuck, grounded or open motor winding, open internal overload. 
FIX: Wait at least 2 hours for overload to reset; if still open, replace the compressor. 

CODE: Too little cooling. 
PROBLEM: Low voltage condition. 
FIX: Add start kit components. 

CODE: Too little cooling. 
PROBLEM: Improperly sized unit. 
FIX: Recalculate load. 

CODE: Too little cooling. 
PROBLEM: Improper indoor airflow. 
FIX: Check-should be approximately 400 CFM per ton. 

CODE: Too little cooling. 
PROBLEM: Incorrect refrigerant charge. 
FIX: Charge per procedure in installation manual. 

CODE: Too little cooling. 
PROBLEM: Air, non-condensables or moisture in system. 
FIX: Recover refrigerant. 

CODE: Compressor operates in short cycles. 
PROBLEM: Incorrect voltage. 
FIX: At compressor terminals, voltage must be +/10% of nameplate marking when unit is operating. 

CODE: Compressor operates in short cycles. 
PROBLEM: Defective overload protector. 
FIX: Replace - check for correct voltage. 

CODE: Compressor operates in short cycles. 
PROBLEM: Refrigerant undercharge. 
FIX: Add refrigerant. 

CODE: High head pressure; Low suction pressure. 
PROBLEM: Restriction in liquid line, expansion device or filter drier. 
FIX: Remove or replace defective component. 

CODE: High head pressure; Low suction pressure. 
PROBLEM: Lack of sufficient indoor airflow. 
FIX: Clean/check filters, registers, or evaporator coil that may cause a restriction. 

CODE: High head pressure; Normal suction pressure. 
PROBLEM: Dirty outdoor coil. 
FIX: Clean coil. 

CODE: High head pressure; Normal suction pressure. 
PROBLEM: Refrigerant overcharge. 
FIX: Correct system charge. 

CODE: High head pressure; Normal suction pressure. 
PROBLEM: Outdoor fan not running. 
FIX: Repair or replace. 

CODE: High head pressure; Normal suction pressure. 
PROBLEM: Air or non-condensables in system. 
FIX: Recover refrigerant, evacuate and recharge. 

CODE: Low head pressure; High suction pressure. 
PROBLEM: Expansion device stuck in open position. 
FIX: Replace expansion device. 

CODE: Low head pressure; High suction pressure. 
PROBLEM: Defective compressor valves. 
FIX: Replace compressor. 

CODE: Low suction pressure; Compressor cool. Ice on indoor coil. 
PROBLEM: Low indoor airflow. 
FIX: Increase speed of blower or reduce restriction - replace air filter. 

CODE: Low suction pressure; Compressor cool. Ice on indoor coil. 
PROBLEM: Operating below 65F (18C) outdoors. 
FIX: Add low ambient kit. 

CODE: Low suction pressure; Compressor cool. Ice on indoor coil. 
PROBLEM: Moisture in system. 
FIX: Recover refrigerant - evacuate and recharge - replace filter drier. 

CODE: High suction pressure; or fluctuating head and suction pressures. 
PROBLEM: Excessive load. 
FIX: Recheck load calculation. 

CODE: High suction pressure; or fluctuating head and suction pressures. 
PROBLEM: Defective compressor. 
FIX: Replace. 

CODE: High suction pressure; or fluctuating head and suction pressures. 
PROBLEM: TXV hunting. 
FIX: Check TXV bulb clamp - check air distribution on coil - replace TXV. 

CODE: High suction pressure; or fluctuating head and suction pressures. 
PROBLEM: Air or non-condensables in system. 
FIX: Recover refrigerant, evacuate and recharge. 

CODE: Pulsing noise at expansion device or liquid line. 
PROBLEM: Air or non-condensables in system. 
FIX: Recover refrigerant, evacuate and recharge. 

CODE: Registers sweat. 
PROBLEM: Low indoor airflow. 
FIX: Increase speed of blower or reduce restriction - replace air filter.

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