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