Rheem Air Conditioners Error Codes

E0

Rheem ductless mini‑split indoor unit displays E0 and will not operate or responds erratically to remote commands.

Indoor Unit EEPROM/Memory Communication Fault

E1

Rheem mini‑split or inverter air conditioner shows E1 and stops cooling or heating; outdoor unit may not start.

Indoor–Outdoor Communication Failure

E2

Rheem ductless indoor unit displays E2 and stops cooling; coil may ice up or unit may short cycle.

Indoor Evaporator Coil Temperature Sensor (T1) Fault

E3

Rheem mini‑split shows E3 and may shut down during cooling or defrost; outdoor fan may stop unexpectedly.

Outdoor Coil Temperature Sensor (T2) Fault

E4

Rheem inverter air conditioner displays E4 and may shut down in heating mode or during defrost cycles.

Discharge Pipe Temperature Sensor (Compressor Discharge Thermistor) Fault

E5

Rheem mini‑split shows E5 and the outdoor unit does not start or stops shortly after starting.

Outdoor Unit Overcurrent / Compressor Overload Protection

E6

Rheem ductless system displays E6 and may run only briefly or not at all; sometimes accompanied by unusual compressor noise.

Compressor Low-Speed / IPM Drive Fault

E7

Rheem multi‑zone mini‑split shows E7 and one or more indoor units will not operate.

Indoor Unit Addressing / Mode Conflict Fault

E8

Rheem inverter air conditioner displays E8 and may shut down during heavy load; indoor airflow may feel weak.

Indoor Fan Motor or Fan Feedback Fault

E9

Rheem ductless indoor unit shows E9 and may leak water or shut down unexpectedly.

Indoor Unit Full Drain Pan / Water Level Sensor Fault

F0

Rheem inverter outdoor unit shows F0 and will not start cooling or heating.

Refrigerant System Low Charge / Low Pressure Protection

F1

Rheem inverter air conditioner displays F1 and may shut down during high load conditions.

Indoor Ambient Temperature Sensor (Room Thermistor) Fault

F2

Rheem inverter system shows F2 and may cycle off prematurely or fail to reach set temperature.

Outdoor Ambient Temperature Sensor Fault

F3

Rheem inverter outdoor unit displays F3 and may shut down in heating mode or during defrost.

Compressor Suction Temperature Sensor Fault

F4

Rheem inverter system shows F4 and may not start the compressor; outdoor fan may still run.

Compressor Discharge Temperature High / Overheat Protection

F5

Rheem inverter air conditioner displays F5 and may shut down during cooling; outdoor fan may cycle abnormally.

Outdoor Fan Motor or Fan Feedback Fault

F6

Rheem inverter system shows F6 and may not modulate capacity correctly; compressor may run at limited speed.

Compressor Current Sensing / IPM Overcurrent Fault

H0

Rheem inverter air conditioner displays H0 and may not respond to remote commands or may lock out.

Indoor Unit EEPROM Parameter Error

H1

Rheem inverter system shows H1 and may stop heating; defrost cycles may be abnormal.

Defrost Protection / Outdoor Coil Frost Overload

H2

Rheem inverter air conditioner displays H2 and may shut down in heating mode; indoor unit may blow cool air.

Compressor Overheat / High Discharge Temperature Protection

H3

Rheem inverter outdoor unit shows H3 and shuts down; compressor may be very hot to the touch.

Compressor Overload / Thermal Protection Trip

H4

Rheem inverter system displays H4 and may not start; indoor unit may show standby only.

Indoor–Outdoor Mismatch or Configuration Error

H5

Rheem inverter air conditioner shows H5 and may shut down; outdoor unit may be unresponsive.

IPM (Inverter Power Module) Protection / Overheat

H6

Rheem multi‑zone system displays H6 and one or more indoor units do not respond or show communication errors.

Indoor Fan or Indoor Unit Communication Fault

Symptom

Rheem air conditioner blows warm air in cooling mode; outdoor unit may not be running.

Outdoor Unit Non-Operation / Contactor or Control Fault

Symptom

Rheem air conditioner causes lights to dim or breakers to trip when the compressor starts.

High Inrush Current / Electrical Supply Issue

Symptom

Rheem air conditioner emits a musty or moldy odor when starting up.

Biological Growth on Evaporator Coil or Drain Pan

Symptom

Rheem air conditioner occasionally freezes up; ice forms on the indoor coil or suction line.

Evaporator Coil Freeze-Up

Symptom

Rheem air conditioner runs but water drips from the indoor unit or from ceiling below air handler.

Condensate Drainage Failure / Water Leak

Symptom

Rheem air conditioner runs continuously and struggles to reach set temperature on very hot days.

Capacity or Airflow Deficiency

Symptom

Rheem air conditioner short cycles, turning on and off frequently without reaching set temperature.

Short Cycling / Control or Capacity Issue

Symptom

Rheem air conditioner thermostat shows error or blank screen, but equipment has power.

Thermostat Power or Communication Issue

Symptom

Rheem air conditioner will not start at all; no indoor fan, no outdoor unit operation, and no display.

No Power / Control Circuit Dead

Symptom

Rheem ductless indoor unit louvers do not move or are stuck in one position.

Louver Motor or Linkage Failure

Symptom

Rheem ductless remote control does not operate the indoor unit, but unit works from manual controls.

Remote Control or IR Receiver Fault

Symptom

Rheem indoor unit makes a loud squealing or grinding noise when the blower runs.

Indoor Blower Mechanical Noise

Symptom

Rheem outdoor condenser runs but indoor blower does not; little or no air from vents.

Indoor Blower Motor Failure or Control Fault

Symptom

Rheem outdoor unit is very loud during operation, with rattling or buzzing noises.

Excessive Outdoor Noise / Vibration

Symptom

Rheem split air conditioner runs but does not cool well; supply air is only slightly cooler than room air.

Insufficient Cooling Capacity / Underperformance