Rheem Furnace Diagnostic Codes

Many times when you are having problems with your furnace, especially with the newer models, a code will come up indicating there is an issue with your furnace. The three most common Rheem furnace diagnostic codes relate to the ignitor, the blower, and the flame sensor.

When these problems occur a diagnostic code will appear either on the thermostat or inside the control panel. If you notice that a diagnostic code has come up and your furnace is malfunctioning, you have options, on how to deal with it and get your furnace working properly.

If your ignitor is malfunctioning, depending on the model of the furnace you own, you will probably get a Rheem diagnostic code. In cases such as this the diagnostic code can help you get your furnace back up and running.

You should start by calling Rheem and telling them what code has appeared on your furnace. They can then, either help you remedy the problem over the phone, get the correct parts sent to you, or inform you that you will need the assistance of a technician. The codes exist to help you determine what is wrong and how to fix it quickly and inexpensively.

Sometimes when when you get the Rheem diagnostic code about your blower, this is something you may be able to take care of on your own. Sometimes the timer on the fan is not set at the right time, and the blower will start to run before the unit has started heating, causing cold air to blow into your home.

Fixing this, is just a matter of adjusting the timer on the blower to come on when the unit has heated. If this does not solve your problem, then you may need to call and get customer support, or call a technician to get this problem taken care of before your house gets too cold.

The flame sensor is a sensitive piece of equipment in your furnace. If you are getting the Rheem diagnostic code telling you that your flame sensor is malfunctioning, then you can take steps yourself before calling customer support, or a technician.

Many times, the flame sensor gets dirty. When it is dirty it stops functioning. It is a great idea to clean it regularly to keep this problem from occurring. If this happens the first thing to do is clean it. You will find instructions in your owner’s manual on how to do so. If cleaning does not solve the issue, then call customer support or a technician to have a look at it.

Rheem Diagnostic codes exist to help you determine what is going wrong with your furnace, and to help you get it fixed in a timely fashion. Nobody wants to sit in a cold house in the middle of winter, so if you get a diagnostic code on your furnace, it is a good idea to investigate it before it becomes a bigger problem.

Another good way to stop problems before they start is by cleaning your air filter, and making sure the area the furnace is kept in, is clean, cool, and dry. In the event parts are defective in your furnace, be aware that you do have a ten year limited warranty. If you want to stay warm, pay attention to what your furnace has to say.

Originally posted 2010-12-02 10:14:34.

3 thoughts on “Rheem Furnace Diagnostic Codes

  1. Lynn Stephenson

    I have a Rheem Criterion II gas furnance. When the furnance kicks off and the air is cooling down, it will continue to blow cool/cold air for sometimes as long as 30-45 mins after it shuts off. I understand that the temperature must cool down and it will blow cool air for a few, but not for 30-45 minutes. What could be wrong with it that is causing this? Any help is greatly appreciated.

  2. Lisa Ellis

    My gas furnace is blowing out cold air even when I turn off the thermastat my brother in law got the code it’s Says 3 fast pause and 3 slow. My model: CU5830-C1. Serial #. S6000D39995. Model# PG9MAA036080 seril B

  3. Lisa Ellis

    So what does it mean can u tell me what’s wrong with it

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