rheem air conditioner codes

If you’re looking for help fixing your Rheem air conditioner, look no further! Our comprehensive Rheem air conditioner repair guide will explain common issues, provide troubleshooting tips, and show you how to read your model’s error codes.

CODE: Error Code 0
PROBLEM: Unit is on standby and operating normally.
FIX: Normal operation.

CODE: Error Code C
PROBLEM: Unit is operating normally and in a cooling stage.
FIX: Normal operation.

CODE: Error Code Flashing C
PROBLEM: Cooling was commanded during an active anti-short cycle.
FIX: Wait until unit timer has expired or press the TEST button to defeat short cycle delay.

CODE: Error Code D1
PROBLEM: No shared data.
FIX: Replace memory card with correct system information.

CODE: Error Code D3
PROBLEM: Airflow mismatch.
FIX: Replace with properly sized air handler.

CODE: Error Code D4
PROBLEM: Memory card in control board is invalid.
FIX: Check if memory card is present and ensure it matches device.

CODE: Error Code D8
PROBLEM: Old shared data system data is obsolete.
FIX: If system will not operate, order new memory card to update system information.

CODE: Error Code T
PROBLEM: Unit is in test mode.

CODE: Error Code P
PROBLEM: There’s no current going to the compressor.
FIX: Check to see if the motor protector is open or line voltage is disconnected.

CODE: Error Code 1
PROBLEM: The compressor is running continuously.
FIX: Check to see if there is low refrigerant, air duct leakage, a dirty outdoor coil, or a dirty air filter.

CODE: Error Codes 02, 29, and flashing L29
PROBLEM: High-pressure problem.
FIX: Check if there is a dirty outdoor coil, outdoor fan is not running, liquid line restriction, or excessive refrigerant charge.

CODE: Error Code 03
PROBLEM: Unit is short-cycling.
FIX: Check thermostat wire connections (R. C. 1. & 2) and thermostat location in zone (too close to discharge grill).

CODE: Error Codes 05, 06, 07, L6, and L7
PROBLEM: Problem with the compressor because of an open circuit.
FIX: Check for damaged, miswired. or wrong run capacitor, broken wires, loose connectors, or miswired compressor, compressor windings for continuity, and open compressor internal protector.

CODE: Error Codes L4
PROBLEM: The rotor is locked.
FIX: Check if there is a bad run capacitor, low line voltage, excessive refrigerant in compressor, or seized bearings in compressor.

CODE: Error Code 09
PROBLEM: Secondary voltage is low.
FIX: Check if the control transformer is overloaded or for low line voltage.

CODE: Error Codes 21 and flashing L21
PROBLEM: Low-pressure control is open.
FIX: Check if unit has low refrigerant charge, indoor coil is frozen, dirty indoor coil or filter, indoor blower is not running, or expansion valve is not operating correctly.

CODE: Error Code 27
PROBLEM: Low or no line voltage.
FIX: Check incoming line voltage to the disconnect and unit and wiring connections.

CODE: Error Code 28
PROBLEM: High line voltage fault.
FIX: Check line voltage.

CODE: Error Code 30
PROBLEM: On-board fuse is open.
FIX: Check if low voltage wiring at R and C is damaged or miswired.

CODE: Error Code 80
PROBLEM: Unit isn’t meeting minimum airflow requirements.
FIX: Replace with properly sized unit.

CODE: Error Code 83
PROBLEM: Problem with the condenser coil temperature.
FIX: Check sensor is installed correctly on control and replace the sensor.

CODE: Error Code 84
PROBLEM: Problem with the outdoor ambient temperature fault.
FIX: Check unit placement. If the outdoor unit is in a high temperature area, wait until the ambient temperature drops and check sensor reading. Check sensor is installed correctly on control. Replace the sensor.

CODE: Error Code 93
PROBLEM: There’s a problem with the internal control.
FIX: Check control for proper system operation. Replace control.

rheem air conditioner codes


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I would recommend KDM for sure

August 8, 2020

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Colin JacobsCourtice, ON

I would recommend KDM for any of the services they provide

August 8, 2020

I had a 2nd hand pool heater hooked up and needed help getting it fired up. So I contacted Dan at KDM to see if they could help and was pleased he could make it over within a couple of days. He checked out the gas piping for leaks and proceeded to analyze the components of the control system and determined a faulty pressure switch was likely preventing operation. I was able to source the part and Dan was able to make a 2nd call within a day to install and complete the job. So in summary, I would recommend KDM for any of the services they provide.

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KDM was hired for the Installation and relocation of internal gas line

August 8, 2020

KDM was hired for the Installation and relocation of internal gas line for my basement finishing project.

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Daniel and Steve were amazing, very professional work and courteous

August 8, 2020

Daniel and Steve were amazing, very professional work and courteous….never dealt with more friendly and knowledgeable Hvac technicians.

Rajshar MahomesMarkham, Ontario

I would not hesitate to hire Daniel and his crew again

August 8, 2020

Asked for quotes on a A/C and furnace after 17 years when the A/C unit broke down. I contacted a few HVAC contractors including KDM. Daniel could not have been more helpful and responsive and after reviewing the quotes decided to hire him for the job. Could no have made a better choice. Daniel was patient and upfront and answered all my questions when asked. He upgraded my A/C unit for the same price after the original unit we agreed upon was back ordered. The crew came when they said they would an completed the installation in a timely and orderly fashion.

I would not hesitate to hire Daniel and his crew again. In fact he is coming back to deal with another issue I have next month!

Job well done.

Ian DavidPickering, Ontario

I definitely recommend KDM Home & gas for others

August 8, 2020

I was looking for someone who can do the gas line connection on a weekend and I found the right guys with KDM Home & Gas. Daniel came on Sunday morning to do the work. He installed the new gas line, connected the new gas stove, confirmed no leaks and ensured everything works fine. It was a really hot day outside but he did an excellent job.


RajeevAjax, Ontario

Everything was quick and efficient

August 8, 2020

Assessment happened on a holiday and work was completed the following day. Everything was quick and efficient.
Thanks Daniel.

Chris SouthamWhitby, Ontario