How to Clear Rheem Furnace Codes & Troubleshooting

When the furnace is not functioning correctly, a diagnostic code will be stored in the unit’s memory. These codes can help diagnose the issue and get the system back up and running efficiently. In some cases, this may only take a few minutes to resolve; however, in other cases, it could take longer. Learning how to clear Rheem furnace codes is one way to pinpoint the issue and get things working again. Where there is an issue with any appliance or system, there are usually diagnostic codes that are stored in its memory if it senses a problem with something on its circuits. This makes troubleshooting much easier for those who are fixing it because they can see exactly which circuit caused the red light error code and begin troubleshooting from that point forward.

What Does Clearing Rheem Furnace Codes Do?

When you clear the Rheem furnace error codes, you simply remove the stored code that is currently in the system. This will allow the furnace to turn back on, but it doesn’t fix the issue. If the same code is stored again at some point, the system will turn itself off again because it knows something is not functioning properly. When the system is turned on and off repeatedly, it can cause some serious issues. For example, if you have a programmable thermostat and turn it on manually, it will store an error code in the system. This will turn the furnace off until it is manually cleared again.

How to Clear a Rheem Furnace Code

The first step in how to clear a Rheem furnace code is to turn off the electricity to the furnace. This will prevent any damage to the equipment and the homeowner. Next, you will want to pull the furnace out from the wall. This is done by loosening the screws that hold it in place, pulling it out, and setting it on the floor. Once the furnace is pulled out, look for the control panel on the side. This will have the error code listed, and you can clear it by following the steps in the furnace owner’s manual. Once that is cleared, you can move back into the home and turn the electricity back on.

Rheem Furnace Error Codes

The Rheem furnace error codes listed below are the most common ones that homeowners report experiencing. – A Blower Fan Error is an issue with the motor or the wiring. The motor may be burnt out or faulty, or there could be a loose connection that keeps it from running properly. – An Evaporator Coil Condenser Error will cause the unit to turn off if it senses that the refrigerant levels are too low. This may mean that the unit is low on refrigerant and needs to be refilled. – A High-Pressure Switch Error may mean that the pressure switch is burnt out or that there is a clog in the system. This can be a sign of a faulty filter or a buildup of debris. – In a Low-Pressure Switch Error, the pressure switch is not responding correctly. This may be due to a clog or a faulty switch.

Rheem Furnace Evaporator Coil Condenser Light Error

When the evaporator coil condenser light is on, it simply means that the furnace has detected a problem with the evaporator coil. This may be due to a clog, a broken belt, or a bad motor.

Rheem Furnace Blower Fan Error Codes

The blower fan error codes listed below can mean that the motor is burnt out or has a loose connection. This can be caused by excess debris or a clog in the furnace, or it could be that the motor is failing and needs to be replaced. – Blower Fan Run Time Too Long – This means that the blower fan has been running for too long and needs to be shut off. This is usually due to a clog in the system. – Blower Fan Disconnected – The blower fan has been disconnected, most likely because of a clog in the system. You will need to take a look at the filters and make sure they are clean. If they are clogged, they need to be cleaned or replaced.

Rheem Furnace Control Module Error Codes

The common Rheem furnace control module error codes are listed below. These can be caused by dirt and debris in the system, a clog, or a failing control module. – In a No Power Error, the furnace will not turn on due to a lack of power. Make sure the circuit is on and that there is a working circuit to the furnace. If there is the power to the outlet, then you may need to replace the control module. – In a Sensor Error, you will find that the furnace is not getting an accurate reading from the thermostat. This may be due to a dirty lens or a failing sensor. If this is the case, you will need to clean the lens or replace the sensor. – In a Program Error, you will find that the furnace will not respond to the thermostat or the remote control. This may be due to a faulty or clogged wire or a failing control module.

Rheem Furnace High-Pressure Switch Error Codes

The high-pressure switch error codes listed below usually indicate that the pressure switch is not functioning properly. This could be due to a clog, a low voltage, or a faulty switch. – In an Open Circuit Error, the high-pressure switch is not completing the circuit. This could be due to a clog or faulty wiring. – In a Short Circuit Error, the high-pressure switch is completing the circuit. This could be due to a clog or low voltage.

Rheem Furnace Low-Pressure Switch Error Codes

When the low-pressure switch error codes are listed, the switch may be shorted or clogged. This could mean that the furnace will not come on, or it could just not be heating properly. In most cases, this means that there is a clog or some debris in the system.


Rheem furnaces can be great systems, but they also have their faults. When troubleshooting a Rheem furnace code, you will want to look at all the possible causes to find out what the issue is. Once you have found the issue, you can use the above information to find out how to clear rheem furnace codes and get the system running again.