Rheem Error Code Search

Error code search offers information on the cause of the malfunction and the status of your air conditioner by entering the error code.

Rheem Air Conditioning Codes:

CODE: 0 – Standby
RESULT: No command for unit operation.
FIX: Normal operation.

CODE: C – First Stage Cooling
RESULT: Unit has received a command for first stage cooling.
FIX: Normal operation.

CODE: C Flashing
RESULT: Anti-short cycle timer (3 minutes) or Minimum run timer (30 seconds) active.
FIX: The unit has received a command for first stage cooling during an active anti-short cycle timer or minimum run timer. Wait until unit timer has expired or press the TEST button to defeat short cycle delay.

CODE: C – Second Stage Cooling
RESULT: Unit has received a command for second stage cooling.
FIX: Normal operation.

CODE: C Flashing
RESULT: Anti-short cycle timer (3 minutes) or Minimum run timer (30 seconds) active.
FIX: The unit has received a command for second stage cooling during an active anti-short cycle timer or minimum run timer. Wait unit timer has expired or press the TEST button to defeat short cycle delay.

CODE: H – First Stage Heat Pump
RESULT: Unit has received a command for first stage heat pump.
FIX: Normal operation.

CODE: H Flashing
RESULT: Anti-short cycle timer (3 minutes) or Minimum run timer (30 seconds) action.
FIX: The unit has received a command for first stage heat pump during an active anti-short cycle timer or minimum run time. Wait unit timer has expired or press the TEST button to defeat short cycle delay.

CODE: H – Second Stage Heat Pump
RESULT: Unit has received a command for second stage heat pump.
FIX: Normal operation.

CODE: H Flashing
RESULT: Anti-short cycle timer (3 minutes) or Minimum run timer (30 seconds) active.
FIX: The unit has received a command for second stage heat pump during an active anti-short cycle timer or minimum run timer. Wait unit timer has expired or press the TEST button to defeat short cycle delay.

CODE: D – Defrost Active
RESULT: The unit is undergoing a defrost cycle.
FIX: Normal operation.

CODE: T – Test Mod
RESULT: Test Mod.
FIX: The ICC is in TEST mode.

CODE: P – Protector Trip
RESULT: A command for compressor operation is present but no current is measured to the compressor.
FIX: Motor protector open.

CODE: 01 – Long Run Time (Compressor)
RESULT: The compressor has continuously run for more than 18 hours in the cooling mode.
FIX: Low refrigerant charge. Air ducts have substantial leakage. Dirty indoor air filter. Dirty outdoor coil.

CODE: 02 – High Pressure
RESULT: Compressor limit has opened four (4) times within a call for operation.
FIX: Outdoor coil is dirty (cooling mode). Outdoor fan is not running (cooling mode). Dirty indoor coil or filter (heating mode). Indoor blower is not running (heating mode). Liquid line restriction. Excessive refrigerant charge.

CODE: 03 – Short Cycling
RESULT: ICC detects the run time for the past four (4) compressor or cycles is less than three (3) minutes each .
FIX: Check thermostat wire connection. Check thermostat location in zone..

CODE: L4 – Locked Rotor
RESULT: The ICC detects four (4) consecutive protector trips have occurred and the average run time for each trip is less than 15 seconds.
FIX: Bad run capacitor. Low line voltage. Excessive refrigerant in compressor. Seized bearings in compressor.

CODE: 05 – Open circuit (Compressor Will not Run)
RESULT: The ICC has had a protector trip for longer than 4 hours.
FIX: Check for damaged, miswired, or wrong run capacitor. Check for broken Wires, loose connectors, or miswired compressor. Check compressor windings for continuity. Check for open compressor internal protector.

CODE: 06 – Compressor Open Start Circuit
RESULT: The ICC detects current in the Run circuit but not in the Start circuit of the compressor.
FIX: Check for damaged, miswired, or wrong run capacitor. Check for broken Wires, loose connectors, or miswired compressor. Check compressor windings for continuity.

CODE: L6 – Compressor Open Start Circuit
RESULT: The ICC detects current in the Run circuit but not in the Start circuit of the compressor four (4) times in one compressor call.
FIX: Check for damaged, miswired, or wrong run capacitor. Check for broken Wires, loose connectors, or miswired compressor. Check compressor windings for continuity.

CODE: 07 – Compressor Open Run Circuit
RESULT: The ICC detects current in the Start circuit but not in the Run circuit of the compressor.
FIX: Check for damaged, miswired, or wrong run capacitor. Check for broken Wires, loose connectors, or miswired compressor. Check compressor windings for continuity.

CODE: L7 – Compressor Open Run Circuit
RESULT: The ICC detects current in the Start circuit but not in the Run circuit of the compressor four (4) times in one compressor call.
FIX: Check for damaged, miswired, or wrong run capacitor. Check for broken Wires, loose connectors, or miswired compressor. Check compressor windings for continuity.

CODE: 09 – Low Secondary Volts
RESULT: The secondary voltage at R and C is below 18VAC.
FIX: Control transformer overloaded. Low line voltage.

CODE: 21 – Low Pressure Control Open
RESULT: The ICC detects the LPC is open. Note: The low pressure control is ignored for the first 90 seconds of compressor operation .
FIX: Unit has low refrigerant charge. Indoor coil is frozen (cooling mode). Dirty indoor coil or filter (cooling mode). Indoor blower is not running (cooling mode). Outdoor coil is frozen (heating mode). Expansion valve is not operating correctly.

CODE: L21 Flashing
RESULT: Active Protection, Low Pressure Control Trip.
FIX: LPC has opened 3 times in the same cooling operation, the ICC has locked out the compressor to protect it. ICC alternately flashes L and 21.

CODE: 27
RESULT: Low Line Voltage or No Line Voltage Fault.
FIX: Check incoming line voltage to the disconnect and unit. Check wiring connections.

CODE: 28
RESULT: High Line Voltage Fault.
FIX: Check line voltage.

CODE: 29
RESULT: High Pressure Control Open. The ICC detects the HPC is open.
FIX: Outdoor coil is dirty (cooling mode). Outdoor fan is not running (cooling mode). Dirty indoor coil or filter (heating mode). Indoor blower is not running (heating mode). Liquid line restriction. Excessive refrigerant charge.

CODE: L29 Flashing – Active Protection
RESULT: High Pressure Control Trip.
FIX: LPC has opened 3 times in the same cooling operation, the ICC has locked out the compressor to protect it. ICC alternately flashes L and 29.

CODE: 30 – Fuse Open
RESULT: The ICC detects the on-board fuse is open.
FIX: The 3 amp fuse on the ICC is open. Low voltage Wiring at R and C is damaged or miswired.

CODE: 80 – Low Air Flow
RESULT: The ICC detects that the indoor unit is not providing the minimum airflow requirements.
FIX: Misapplied wrong indoor air mover – replace With properly sized unit.

CODE: 83 – Condenser Coil Temperature Fault
RESULT: The sensor detects an abnormally low or high coil temperature.
FIX: Replace the sensor. Check sensor is installed correctly on control.

CODE: 84 – Outdoor Ambient Temperature Fault
RESULT: The sensor detects an abnormally low or high outdoor ambient temperature.
FIX: Check unit placement – If the outdoor unit is in a high temperature area, wait until the ambient temperature drops and check sensor reading. Replace the sensor. Check sensor is installed correctly on control.

CODE: 93 – Internal Control Fault
RESULT: The sensor detects an abnormally low or high outdoor ambient temperature.The control is not functioning properly.
FIX: Check control for proper system Operation. Replace control.

CODE: d1
RESULT: N0 Shared Data.
FIX: Replace memory card With correct system information.

CODE: d3 – Airflow CFM Mismatch
RESULT: NThe indoor air mover (air handler/furnace) cannot supply the required airflow for proper system operation.
FIX: Misapplied wrong indoor air mover-replace With properly sized air handler/furnace.

CODE: d4 – (Device) Memory Card Invalid for Device
RESULT: The data in the memory card inserted into the control board does not match the data in the control.
FIX: Check memory card to ensure it matches device. Check if memory card is present.

CODE: d8 – Old Shared Data
RESULT: System data is obsolete.
FIX: If system Will not operate, order new memory card to update system information.

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