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Rheem Furnace Repair Guide
Troubleshooting, Error Codes & More
(Updated for 2019)
A complete Rheem furnace repair guide, from how to replace your air filter, to troubleshooting and error codes, model numbers and more!
Please note, the following is for informational purposes only. Any servicing you attempt is at your own risk.
Rheem has been a leader in the HVAC industry for nearly 100 years, and today they’re among North America’s largest manufacturer of heating and cooling systems.
A few of the features people love about their Rheem gas furnaces include that they’re equipped with cutting-edge technologies and advanced diagnostics systems, and have some of the best efficiency ratings in the industry.
To make sure your furnace continues running efficiently and optimally, it’s important to take care of some regular maintenance tasks and be able to identify certain problems, and this quick guide will give you all the information you need.
How to Replace Your Air Filter
An important maintenance task you can do on your own is changing the furnace filter. Not only will this keep your furnace running properly, but it will also improve efficiency and air quality in your house.
The filter should be changed every one to three months during heating season, so here’s how to do it:
- Open, slide, or remove the access panel
- Locate the old filter, which is usually near the cold air intake
- Slide out the old filter
- Insert the new filter by lining up the arrows on the frame
- Replace or close the access panel
What’s Wrong With Your Rheem Furnace?
Remember to always turn your furnace completely off before opening it up to look around or attempt any fix.
|Is your furnace...||The problem might be your...||What's wrong?||How you can fix it:|
|Not heating?||Circuit Breaker/Fuse||Most likely, either the electrical system providing your furnace’s power has shorted or the power switch has blown.||Try resetting your furnace’s circuit breaker. If it has blown, you will need to replace it.|
|Igniter||The furnace’s igniter might either be cracked or faulty.||Check the part for cracks, if it is then replace the igniter. If it isn’t cracked, use a multimeter to test for continuity.|
|Cycling irregularly?||Thermostat||Your thermostat might be adjusting incorrectly, causing the furnace to cycle on and off too often.||If your thermostat has an adjustable calibration scale, adjust the heat anticipator. If this does not stabilize the unit, you may have to replace the thermostat.|
|Not blowing hot air?||Blower Motor||Your blower motor may have completely burnt out. If this doesn’t seem to be the case, then the connecting belt may have simply broken.||Test to see if power is reaching the motor. If it does, but isn’t running, the motor has likely failed. If the motor runs but air doesn’t move, the connecting belt has probably broken. You’ll have to replace the belt.|
|Blowing too much air?||Control Board||The control board regulates the amount of voltage that reaches each functioning part. If the relay that controls the blower motor has failed, it will continually send voltage to the motor.||Replace the control board.|
|Thermostat||The contact that controls the blower motor on your thermostat may be stuck closed, causing the blower motor to run continuously.||Use a multimeter to check for continuity. If it appears the thermostat is the issue, replace it.|
|Leaking water?||Drain Pipe|
|Starting and then stopping shortly after?||Flame Sensor||Your furnace’s flame sensor monitors the burner, detecting whether a flame is present. If it is either defective or dirty, it will not be able to detect a flame.||If dirty, clean the sensor using a fine abrasive pad. If faulty, replace the flame sensor.|
Rheem Furnace Error Codes
Rheem furnaces are all equipped with an advanced 7-segment diagnostic display you can use as a guide if something goes wrong with your heating system. Unlike many other furnaces, Rheem ones don’t use flashing LED light sequences to indicate errors, and the display will instead give you a simple code you can use for diagnostics. For instance, 0 means the unit is in standby, while H means the heat is on.
Here’s what the other diagnostic codes mean:
|Rheem Error Code||What this means|
|Error Code 10||There's a one-hour lockout in place.|
|Error Code 11||The ignition failed.|
|Error Code 12||Low flame detected.|
|Error Code 13||The flame was lost.|
|Error Code 14||There was an unexpected flame.|
|Error Code 20||There was a twinning fault.|
|Error Code 22||Problem with high limit.|
|Error Code 26||Reversal of line and neutral.|
|Error Code 33||Roll-out switch problem.|
|Error Codes 55 & 57||Pressure switch issue.|
|Error Codes 58 & 59||Water or condensation problem.|
|Error Code 61||Problem with the blower.|
|Error Code 93||Problem with the control.|
When Should You Call A Professional?
No heat: Furnaces have many components, and a malfunction with lots of these can result in a furnace that doesn’t produce heat. Some of the most common components involved include the gas, power, thermostat, heat exchanger, and ignitor.
Producing heat but blowing cold air: This means the furnace is working properly but not circulating air the way it should, and the blower motor or a belt in the motor is usually the problem here.
Strange sounds: Mechanical failures and malfunctions do happen, and when they do the furnace will often make whistling, rattling, squealing, gurgling, or other noises.
Gas smells: If your furnace smells like gas, shut off the gas valve, open some windows, and get everybody out of the house. Once you’re safely outside, call your utility company to report a potential gas leak.
Overblowing: If your furnace is blowing too much air, then it could be an issue with the control board or a problem with the thermostat.
Leaking: High-efficiency furnaces produce condensation, which can leak and pool on the floor if a pipe inside breaks or isn’t fitted properly.
Cracks, corrosion, strange smells, or soot: All of these could mean your heat exchanger is cracked, and this needs to be addressed immediately because a damaged heat exchanger can mean dangerous gasses are leaking into the air you breathe.
Who Should You Call?
Furnace maintenance and repairs are crucial to the health of your heating system and the comfort and safety of your family, so it’s important to choose a trusted, reliable, and certified HVAC company when your furnace needs help.
If you don’t already have a company you can depend on, you can use our independent HVAC contractor certification program to find a local company that will have the skills and knowledge to address and fix any furnace problems you may be experiencing.
Rheem’s Warranty Coverage
Rheem has two furnace series, and every model in these series comes with multiple warranties for different components.
- Prestige series furnaces come with a limited 10-year parts warranty, a lifetime conditional unit replacement warranty, and a limited lifetime heat exchanger warranty.
- Classic series furnaces come with a 10-year conditional parts warranty and a limited 5-year parts warranty. Some models in the line also have a 10-year conditional unit replacement warranty, and a 20-year or limited lifetime heat exchanger warranty.
Rheem Model Numbers
Current Rheem Models
Discontinued Rheem Models
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