Rheem Air Conditioner Repair Guide 2019
(Updated for 2019)
Check out our Rheem air conditioner repair guide to learn about replacing your filter, model error codes, troubleshooting tips, common issues, and more.
Please note, the following is for informational purposes only. Any servicing you attempt is at your own risk.
Rheem, At a Glance
Rheem was founded in 1925, and today they are one of North America’s largest HVAC manufacturers. Along with manufacturing many high-efficiency and standard air conditioners, they also make home heating systems, refrigeration products, and more.
When you purchase a Rheem air conditioner, it’s important to take care of it properly to get the most efficient operation and longest life from the unit. Today we’ll tell you about the common maintenance and repair issues you might encounter with your Rheem cooling system.
How to Replace Your Rheem Air Filter
Rheem recommends replacing your air conditioner filter every 90 days, and this will ensure the best air quality in your home, save you money, maximize the unit’s efficiency, and guarantee you get the most years from your air conditioner. Here’s a quick guide to help you through the process of changing the filter:
- Shut off power to the unit to avoid getting a shock
- Find the filter, which is usually found in the return air duct
- Remove the old filter by sliding it out of the slot
- Replace the filter with a new one by using the arrows printed on the filter
- Turn the unit back on
What’s Wrong With Your Rheem Air Conditioner?
Common Air Conditioner Problems and Troubleshooting
Remember to turn your A/C completely off before opening it up to look around or attempt any fix.
Rheem Air Conditioner Error Codes
Your Rheem air conditioner is equipped with a small display that it uses to communicate codes, and these tell you the status of the unit. For instance, if the unit is operating normally, it will display a specific code. However, there are also error display codes that tell you when there’s a problem with your cooling system and what it might be.
It’s important because it can give you an idea of whether you can troubleshoot the problem yourself, or if you should call a licensed technician for repairs. Here’s a list of the most common codes you might see displayed on your Rheem unit:
|Rheem Error Code||What this means||How to fix it|
|Error Code 0||Unit is on standby and operating normally.||Normal operation.|
|Error Code C||Unit is operating normally and in a cooling stage.||Normal operation.|
|Error Code Flashing C||Cooling was commanded during an active anti-short cycle.||Wait until unit timer has expired or press the TEST button to defeat short cycle delay.|
|Error Code D1||No shared data.||Replace memory card with correct system information.|
|Error Code D3||Airflow mismatch.||Replace with properly sized air handler.|
|Error Code D4||Memory card in control board is invalid.||Check if memory card is present and ensure it matches device.|
|Error Code D8||Old shared data system data is obsolete.||If system will not operate, order new memory card to update system information.|
|Error Code T||Unit is in test mode.|
|Error Code P||There's no current going to the compressor.||Check to see if the motor protector is open or line voltage is disconnected.|
|Error Code 1||The compressor is running continuously.||Check to see if there is low refrigerant, air duct leakage, a dirty outdoor coil, or a dirty air filter.|
|Error Codes 02, 29, and flashing L29||High-pressure problem.||Check if there is a dirty outdoor coil, outdoor fan is not running, liquid line restriction, or excessive refrigerant charge.|
|Error Code 03||Unit is short-cycling.||Check thermostat wire connections (R. C. 1. & 2) and thermostat location in zone (too close to discharge grill).|
|Error Codes 05, 06, 07, L6, and L7||Problem with the compressor because of an open circuit.||Check for damaged, miswired. or wrong run capacitor, broken wires, loose connectors, or miswired compressor, compressor windings for continuity, and open compressor internal protector.|
|Error Codes L4||The rotor is locked.||Check if there is a bad run capacitor, low line voltage, excessive refrigerant in compressor, or seized bearings in compressor.|
|Error Code 09||Secondary voltage is low.||Check if the control transformer is overloaded or for low line voltage.|
|Error Codes 21 and flashing L21||Low-pressure control is open.||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.|
|Error Code 27||Low or no line voltage.||Check incoming line voltage to the disconnect and unit and wiring connections.|
|Error Code 28||High line voltage fault.||Check line voltage.|
|Error Code 30||On-board fuse is open.||Check if low voltage wiring at R and C is damaged or miswired.|
|Error Code 80||Unit isn't meeting minimum airflow requirements.||Replace with properly sized unit.|
|Error Code 83||Problem with the condenser coil temperature.||Check sensor is installed correctly on control and replace the sensor.|
|Error Code 84||Problem with the outdoor ambient temperature fault.||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.|
|Error Code 93||There's a problem with the internal control.||Check control for proper system operation. Replace control.|
When to Get a Technician for Rheem A/C Repairs
While you can address some air conditioner maintenance and problems yourself, some require help from a licensed technician. A few of these problems include:
- Unit is operating erratically
- There’s a problem with the compressor or coils
- You smell burning coming from the unit
- Unit won’t run or cool properly, and it’s not because of a thermostat setting
- Circuit breaker keeps tripping, or power fuse keeps blowing
- Power cord is damaged or getting hot
- Refrigerant Leaks
- Unit is making loud and strange sounds
- Wiring or electrical problems
- Unit is leaking, or water is dripping onto it
If you encounter any of these problems or suspect them, you should turn the unit off right away and don’t turn it back on until it’s been serviced by a licensed technician.
Who to Call For Rheem Air Conditioner Repairs
When your air conditioner breaks down or requires maintenance or repairs, it’s important to seek help to ensure your comfort and to keep the unit in good working order. But if you don’t know who to trust for air conditioner maintenance, then choosing the right HVAC company can be daunting.
To help you find the right technician, we’ve created an independent HVAC contractor certified partners page that can help you find a company that has all the right licenses and insurance, a good reputation, experience in the field, and more.
Rheem’s Warranty Coverage
New Rheem air conditioners are all protected by a warranty that could save you hundreds or thousands of dollars on repair costs. The warranty terms depend on the model of your cooling system.
Air conditioners in Rheem’s prestige series come with a 10-year limited parts warranty. Models from their Classic series come with a 5-year limited parts warranty, as well as a 10-year conditional parts warranty. To be eligible for the limited warranty, certain conditions must be met regarding registration, installation, and ownership.
➤ Protect your Rheem air conditioner: Register and access your Rheem A/C warranty here
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