Error Code	Symptom	Fault Type	Guide
E0	Thermostat displays E0 and the American Standard air conditioner will not respond to temperature changes	Indoor-Outdoor Communication Fault	View Details
E1	Thermostat or wall control shows E1 and the American Standard air conditioner does not cool	High-Pressure Switch Open	View Details
E2	Thermostat or control board shows E2 and cooling stops intermittently	Low-Pressure Switch Open / Loss of Charge	View Details
E3	Thermostat or control module shows E3 and the outdoor unit will not start	Outdoor Temperature Sensor Fault	View Details
E4	Thermostat or indoor display shows E4 and the system cycles off quickly after starting	Indoor Coil Temperature Sensor Fault / Freeze Protection Error	View Details
E5	Thermostat or control shows E5 and the compressor does not start or shuts down quickly	Compressor Overload / Overcurrent Protection	View Details
E6	Thermostat or control module shows E6 and the indoor blower runs but the outdoor unit does not	Outdoor Unit Communication / Control Fault	View Details
E7	Thermostat or display shows E7 and the system will not switch modes correctly (cool/heat/fan)	Mode Control / Reversing Valve Circuit Fault (Heat Pump Models)	View Details
E8	Thermostat or indoor display shows E8 and the blower shuts down unexpectedly	Indoor Blower Motor Fault / ECM Communication Error	View Details
E9	Thermostat or control shows E9 and the system locks out after several failed start attempts	System Lockout / Multiple Faults Detected	View Details
F01	American Standard thermostat displays F01 and will not control the air conditioner	Thermostat Internal Fault	View Details
F02	Thermostat shows F02 and the indoor temperature reading is obviously incorrect	Indoor Temperature Sensor Fault (Thermostat)	View Details
F03	Thermostat or control shows F03 and the system will not run in cooling mode	Outdoor Unit Not Responding	View Details
H0	American Standard heat pump shows H0 and will not enter defrost or heat properly	Defrost Control Fault	View Details
H1	Heat pump displays H1 and shuts down heating operation	High Discharge Temperature / Overheat Protection	View Details
H2	Heat pump shows H2 and alternates between heating and standby frequently	Low Outdoor Temperature / Protection Mode	View Details
L1	Indoor control board LED flashes L1 pattern and the blower does not start in cooling	Blower Motor Lockout	View Details
L2	Indoor control board LED flashes L2 and the system will not respond to thermostat calls	Low-Voltage Short / Fuse Open	View Details
L3	Indoor control board LED flashes L3 and the compressor cycles off on safety	Pressure Switch Lockout	View Details
L4	Indoor control board LED flashes L4 and the compressor does not start	Open Compressor Circuit / Contactor Fault	View Details
L5	Indoor control board LED flashes L5 and the system shuts down shortly after starting	Line Voltage Polarity / Ground Fault	View Details
–	American Standard air conditioner causes excessive vibration and rattling in the home	System Vibration / Mounting Issues	View Details
–	American Standard air conditioner cycles on but shuts off after a few seconds	Immediate Shutdown After Start	View Details
–	American Standard air conditioner fan runs but stops and starts repeatedly without thermostat changes	Blower or Fan Control Issue	View Details
–	American Standard air conditioner freezes up with ice on the indoor coil or suction line	Evaporator Coil Icing	View Details
–	American Standard air conditioner makes loud banging or clanking noises from the outdoor unit	Mechanical Noise from Condensing Unit	View Details
–	American Standard air conditioner outdoor fan runs but indoor blower does not	Indoor Blower Non-Operation	View Details
–	American Standard air conditioner runs but does not cool the home effectively	Insufficient Cooling Capacity / Poor Heat Transfer	View Details
–	American Standard air conditioner runs but some rooms are not getting enough airflow	Uneven Air Distribution	View Details
–	American Standard air conditioner short cycles, turning on and off every few minutes	Short Cycling	View Details
–	American Standard air conditioner trips the breaker when it starts	Breaker Trip on Startup	View Details
–	American Standard air conditioner will not start at all, no indoor blower and no outdoor unit operation	Complete System No-Start	View Details
–	American Standard heat pump blows cool air in heat mode or warm air in cool mode	Reversing Valve or Control Problem	View Details
–	American Standard outdoor unit runs continuously and rarely shuts off	Continuous Operation / Long Run Time	View Details
–	American Standard thermostat is on but does not call for cooling even when room is warm	Thermostat Control Issue	View Details
–	Burning or electrical smell when American Standard air conditioner starts	Overheating Electrical Component	View Details
–	Indoor American Standard air handler makes a loud squealing or screeching noise when running	Blower Motor or Wheel Noise	View Details
–	Indoor blower runs but air from vents is warm when cooling is selected	Compressor Not Running	View Details
–	Musty or moldy odor from vents when American Standard air conditioner runs	Biological Growth in Evaporator or Ducts	View Details
–	Outdoor American Standard condensing unit will not start at all, but the indoor blower runs	Outdoor Unit No-Start Condition	View Details
–	Water dripping from secondary drain pan or ceiling under American Standard air handler	Primary Drain Pan Overflow	View Details
–	Water leaking from American Standard indoor air handler or furnace cabinet during cooling	Condensate Drainage Failure	View Details

American Standard Air Conditioners Error Codes

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