Error Code	Symptom	Fault Type	Guide
E0	Indoor unit display shows E0 and system will not start cooling or heating	EEPROM / Main Control Board Communication Fault	View Details
E1	E1 displayed on indoor unit, system does not run or stops shortly after starting	Indoor / Outdoor Communication Failure	View Details
E2	Indoor unit shows E2 and stops cooling; fan may still run	Indoor Coil (Evaporator) Freeze Protection / Low Temperature Fault	View Details
E3	E3 error and outdoor unit shuts down during cooling or heating	Outdoor Coil Overload / High Pressure Protection	View Details
E4	E4 displayed, unit stops and may restart after a delay	High Discharge Temperature / Compressor Overheat Protection	View Details
E5	E5 error, compressor does not start or shuts down quickly	Overcurrent Protection / Compressor Overload	View Details
E6	E6 displayed, indoor fan may run but no cooling or heating	Indoor Fan Motor / DC Motor Fault	View Details
E7	E7 error, system will not run in one mode (cool or heat) or at all	Mode Conflict / 4-Way Reversing Valve or Control Logic Fault	View Details
E8	E8 displayed, unit shuts down due to low indoor airflow or overheat	Indoor Overheat / Low Airflow Protection	View Details
E9	E9 error, unit may leak water or shut down unexpectedly	Condensate Overflow / Drain Pan Full Protection	View Details
F0	F0 code on display, unit stops cooling	Refrigerant System Low Pressure / Undercharge Protection	View Details
F1	F1 displayed, indoor unit stops or runs erratically	Indoor Ambient Temperature Sensor Fault	View Details
F2	F2 error, unit may short cycle or not maintain set temperature	Evaporator Coil Temperature Sensor Fault	View Details
F3	F3 displayed, outdoor unit may not run correctly	Outdoor Ambient Temperature Sensor Fault	View Details
F4	F4 error, outdoor unit shuts down in heating mode	Outdoor Coil Temperature Sensor Fault / Defrost Sensor Error	View Details
F5	F5 displayed, unit may not respond to remote or wall control properly	Indoor Display / Keypad Board Communication Fault	View Details
H1	H1 code during heating mode, outdoor unit runs but little heat output	Defrost Mode Active / Low Outdoor Coil Temperature	View Details
H2	H2 code, unit stops heating to protect compressor	Compressor Overheat / High Temperature Protection in Heat Mode	View Details
H3	H3 error, compressor does not start or shuts down quickly in any mode	Compressor Overload Trip / Internal Thermal Protection	View Details
H4	H4 displayed, system stops and may not respond to thermostat	System Lockout / Multiple Faults Detected	View Details
P0	P0 code, inverter-driven outdoor unit will not start or runs at limited capacity	Inverter Module / DC Bus Voltage Fault	View Details
P1	P1 displayed, unit may start then shut down with no cooling	Low Refrigerant Pressure / Protection in Inverter System	View Details
P2	P2 code, unit stops due to high pressure condition	High Refrigerant Pressure Protection in Inverter System	View Details
P3	P3 displayed, compressor speed limited or unit shuts down intermittently	Outdoor Heat Sink Overheat / Inverter Module Temperature Protection	View Details
P4	P4 error, indoor unit stops and may flash LEDs	Indoor Fan Motor / DC Motor Protection in Inverter System	View Details
–	Air conditioner runs but does not cool the home adequately	Insufficient Cooling Capacity / Performance Degradation	View Details
–	Air conditioner short cycles (turns on and off frequently)	Short Cycling / Control or Capacity Issue	View Details
–	Breaker trips when air conditioner starts or shortly after	Overcurrent / Short Circuit Condition	View Details
–	Burning or electrical smell from indoor or outdoor unit	Overheating Electrical Component	View Details
–	High-pitched squealing or grinding noise from indoor unit	Blower Motor or Wheel Bearing Failure	View Details
–	Indoor blower does not run, but outdoor unit is operating	Indoor Blower Motor Failure	View Details
–	Indoor blower runs but outdoor unit does not (no fan, no compressor)	Outdoor Control Circuit Failure	View Details
–	Indoor unit blows warm air in cooling mode	Loss of Cooling / Reversing Valve or Charge Issue	View Details
–	Indoor unit freezes up with ice on the evaporator coil	Evaporator Coil Icing	View Details
–	Indoor unit is very noisy with vibration transmitted through the structure	Improper Mounting / Vibration Transmission	View Details
–	Loud banging or rattling noise from outdoor Fraser‑Johnston condenser	Mechanical Vibration / Fan or Mounting Issue	View Details
–	Outdoor fan runs but compressor does not start	Compressor Start Failure	View Details
–	Outdoor Fraser‑Johnston condenser will not start at all (no fan, no compressor)	No Power to Outdoor Unit	View Details
–	Outdoor unit runs continuously and will not shut off	Runaway Cooling / Stuck Contactor or Control Fault	View Details
–	Strong musty or moldy odor when the air conditioner runs	Biological Growth on Evaporator Coil and Drain Pan	View Details
–	Thermostat display is blank and system does not respond	Loss of 24V Control Power	View Details
–	Uneven cooling between rooms or floors	Air Distribution / Ductwork Imbalance	View Details
–	Water leaking from indoor Fraser‑Johnston air handler or ceiling cassette	Condensate Drain Blockage / Pan Overflow	View Details

Fraser-Johnston Air Conditioners Error Codes

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