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Rheem furnaces are known for their efficiency and reliability, but like any HVAC system, they can experience issues over time. Understanding error codes can help diagnose problems quickly, saving you time and money on repairs. Our guide covers common Rheem furnace error codes, their meanings, and how to fix them
About Rheem: A Trusted HVAC Brand
Rheem has been manufacturing HVAC equipment for decades and is recognized for its innovation and energy-efficient heating solutions. The company was founded in the 1920s and has since become a leading name in residential and commercial heating and cooling systems.
Rheem furnaces are designed with durability, efficiency, and user-friendly technology in mind. Many models feature high AFUE ratings, which help homeowners reduce energy consumption and lower heating costs. Additionally, Rheem’s commitment to smart home integration allows for better control and monitoring of HVAC performance.
One of the standout features of Rheem furnaces is their advanced self-diagnostic system, which displays error codes when an issue arises. This helps both homeowners and technicians quickly identify and resolve problems, minimizing downtime and costly repairs. Rheem also offers strong warranty coverage, reinforcing its reputation as a reliable brand in the HVAC industry.
When Do Rheem Furnace Error Codes Appear?
Furnace error codes typically appear when the furnace detects an issue that prevents normal operation. This can be due to sensor malfunctions, ignition failures, airflow restrictions, or electrical problems. Some error codes indicate minor issues that can be resolved with simple maintenance, while others signal critical faults that require immediate attention from a professional. Understanding what triggers Rheem furnace codes can help homeowners take quick action and prevent further damage to their heating system.
Common Rheem Furnace Error Codes and Fixes
Error Code 0: Standby Mode
Description: The furnace is waiting for a heating command. Recommendations: No action needed unless the furnace fails to respond when heating is required.
Error Code | Description | Recommended Action |
|---|---|---|
0 | Standby Mode | No action needed unless furnace fails to respond. |
Error Code F: Continuous Fan Operation
Description: The blower fan is running continuously without a heating cycle. Recommendations: Check thermostat settings and switch the fan from “On” to “Auto.”
Error Code | Description | Recommended Action |
|---|---|---|
F
| Continuous Fan Operation
| Adjust thermostat settings to “Auto.” |
Error Code H: Active Heating Mode
Description: The furnace is in the middle of a heating cycle. Recommendations: No action needed if heating is operating normally.
Error Code | Description | Recommended Action |
|---|---|---|
H
| Active Heating Mode
| No action needed if heating functions properly. |
Error Code 10: One-Hour Lockout
Description: The furnace has attempted ignition multiple times and locked out for safety. Recommendations: Check the gas supply, ignitor, and flame sensor. Reset the system after addressing any issues.
Error Code | Description | Recommended Action |
|---|---|---|
10
| One-Hour Lockout
| Check gas supply, ignitor, and flame sensor. Reset system. |
Error Code 11: Ignition Failure
Description: The flame did not ignite. Recommendations: Ensure gas is flowing, clean the ignitor, and check the gas valve operation.
Error Code | Description | Recommended Action |
|---|---|---|
11
| Ignition Failure
| Verify gas flow, clean ignitor, check gas valve. |
Error Code 12: Weak Flame Signal
Description: The sensor detects a weak flame. Recommendations: Clean or replace the flame sensor and check for burner obstructions.
Error Code | Description | Recommended Action |
|---|---|---|
12
| Weak Flame Signal
| Clean or replace flame sensor, check burner. |
Error Code 13: Flame Extinguished
Description: The flame was detected but unexpectedly went out. Recommendations: Check gas supply, flame sensor, and inducer motor operation.
Error Code | Description | Recommended Action |
|---|---|---|
13
| Flame Extinguished
| Check gas supply, flame sensor, and inducer motor.
|
Error Code 14: Unexpected Flame Detection
Description: The system detected a flame when it should not be present. Recommendations: This may indicate a faulty gas valve or control board. Contact a professional furnace service immediately.
Error Code | Description | Recommended Action |
|---|---|---|
14
| Unexpected Flame Detection
| Contact a professional to inspect gas valve or control board. |
Error Code 20: Twinning Fault
Description: Issues with settings or wiring in dual furnace configurations. Recommendations: Verify wiring and compatibility of control boards.
Error Code | Description | Recommended Action |
|---|---|---|
20
| Twinning Fault
| Check wiring and ensure correct configuration. |
Error Code 22: High Limit Switch Activated
Description: The switch is triggered due to excessive temperature. Recommendations: Inspect for blocked airflow (e.g., dirty filters or closed vents). Replace switch if necessary.
Error Code | Description | Recommended Action |
|---|---|---|
22
| High Limit Switch Triggered
| Inspect for airflow restrictions. Replace switch if needed. |
Error Code 26: Incorrect Wiring
Description: Faulty wiring detected, which poses a safety hazard. Recommendations: Shut off power immediately and correct wiring issues.
Error Code | Description | Recommended Action |
|---|---|---|
26
| Incorrect Wiring
| Shut off power and fix wiring immediately. |
Error Code 33: Rollout Switch Tripped
Description: The flame has rolled out of the burner chamber. Recommendations: Inspect for vent blockages or a cracked heat exchanger. Reset switch if safe.
Error Code | Description | Recommended Action |
|---|---|---|
33
| Rollout Switch Tripped
| Check for vent blockages and cracked heat exchanger. |
Error Code 55 & 57: Pressure Switch Issues
Description: The pressure switch is not closing (55) or opening (57) as expected. Recommendations: Inspect venting, tubing, and the inducer motor for blockages or malfunctions.
Error Code | Description | Recommended Action |
|---|---|---|
55
| Pressure Switch Not Closing |
Inspect venting, tubing, and inducer motor. |
57
| Pressure Switch Not Opening
| Check airflow and ensure switch functionality. |
Error Code 61: Blower Motor Fault
Description: The blower motor isn’t running properly. Recommendations: Check the capacitor, wiring, and motor function.
Error Code | Description | Recommended Action |
|---|---|---|
61
| Blower Motor Fault
| Inspect blower capacitor, wiring, and motor. |
How Often Do Rheem Furnaces Experience Issues?
Rheem furnaces are built to be reliable, but like any heating system, they can develop issues over time — especially without regular furnace maintenance. The most common problems tend to be ignition failures, pressure switch malfunctions, and flame sensor troubles, often caused by dirt buildup or restricted airflow. The good news? With proper care and servicing, a Rheem furnace can run efficiently for 15–20 years with minimal problems. Keeping up with routine maintenance can go a long way in preventing unexpected breakdowns.
Cost of Rheem Furnace Repairs in Canada
Furnace repair costs in Ontario vary based on the complexity of the issue, labor rates in your area, and whether replacement parts are needed. Below is a more detailed breakdown of typical repair costs:
- Flame Sensor Cleaning/Replacement: $100–$250 – A dirty or faulty flame sensor can cause ignition issues. Cleaning is usually inexpensive, but replacement can cost more if the sensor is damaged.
- Ignitor Replacement: $150–$300 – A malfunctioning ignitor prevents the furnace from lighting properly, requiring a quick and affordable fix.
- Blower Motor Replacement: $400–$800 – The blower motor is responsible for circulating warm air. If it fails, heating efficiency drops, leading to uneven temperatures in your home.
- Heat Exchanger Replacement: $1,000–$2,000 – One of the most expensive repairs, a cracked heat exchanger poses serious safety risks, including carbon monoxide leaks.
Regular maintenance, such as cleaning components and replacing filters, can help prevent these costly repairs and extend your furnace’s lifespan. Annual inspections ensure your Rheem furnace runs efficiently throughout the winter.
Conclusion
Understanding Rheem furnace error codes can help you troubleshoot problems efficiently. However, some issues require professional expertise. If your furnace is displaying an error code that you don’t know how to fix, it’s best to call an experienced technician.
Delaying repairs can lead to more extensive damage and higher costs. If you need reliable HVAC service in Canada, our team is here to help. Contact us today for fast, professional furnace repairs and maintenance.
FAQs
What should I do if my Rheem furnace shows an error code but works fine?
Sometimes, Rheem furnaces may display temporary error codes due to minor glitches. Try resetting the system by turning off the power for 30 seconds, then turning the furnace back on. If the error code doesn’t go away, consult the user manual or call a professional.
Can I reset the Rheem error by myself?
Yes, most errors can be reset by turning off the furnace for 30 seconds and then turning it back on. However, if the code appears again, it means the issue hasn’t been resolved, and diagnostics are needed.
Why won’t my Rheem furnace turn on, even without an error?
This could be due to several reasons: no gas supply, a clogged air filter, a thermostat failure, or a blown fuse. Check these components before calling a professional.
What does error 11 mean on a Rheem furnace?
Error 11 indicates an ignition failure. This could be caused by a lack of gas, a faulty igniter, or a dirty flame sensor. Cleaning the sensor and checking the gas supply often helps resolve the issue.
How often should I service my Rheem furnace to avoid errors?
It’s recommended to have a professional service your furnace once a year before the heating season begins. This helps prevent dirt buildup, part wear, and error codes.
Why does my Rheem furnace show error 22 and shut off?
Error 22 means the limit switch has tripped due to overheating. Common causes include clogged filters, blocked vents, or a faulty switch. Check the airflow and clean the filters.
How can I tell if the error requires urgent repair?
If the furnace doesn’t turn on, makes strange noises, or you smell gas, turn it off immediately and call a professional. Errors related to gas or overheating can be hazardous.
How much does it cost to repair a Rheem furnace in Canada?
Repair costs depend on the issue:
- Flame sensor cleaning or replacement: $100–$250
- Igniter replacement: $150–$300
- Fan motor replacement: $400–$800
- Heat exchanger replacement: $1,000–$2,000
Why does my Rheem furnace keep running even after turning off the thermostat?
This could be due to incorrect thermostat settings, a stuck fan relay, or a fault in the control board. Try switching the fan from “On” to “Auto” and rebooting the system.
When should I replace my Rheem furnace instead of repairing it?
If your furnace is over 15 years old and needs an expensive repair, like a heat exchanger or fan motor replacement, it’s more cost-effective in the long run to replace it with a new model.
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