Rheem Furnace Error Codes
A major HVAC manufacturer offering a wide range of residential furnaces with strong warranty support.
How Rheem Furnaces Display Error Codes
The Integrated Furnace Control (IFC) UT Electronic Controls 1012-925 uses a green STATUS LED and an amber FLAME LED to indicate system status. The green STATUS LED blink codes are: 1 blink = soft lockout, 2 blinks = pressure switch circuit open, 3 blinks = limit circuit open, 4 blinks = pressure switch circuit closed, 5 blinks = twin fault (optional). The amber FLAME LED codes are: OFF = no flame present, RAPID BLINK = unexpected flame, SLOW BLINK = marginal flame sense, STEADY ON = normal flame sense.
This site covers 4 Rheem furnace models and a total of 85 error code entries. Select your model below to see the full code list with causes and repair guidance.
Rheem Furnace Models
DIY-Friendly Rheem Error Codes
These error codes on Rheem furnaces are commonly resolved by a careful homeowner without a service call — typically by cleaning the flame sensor, checking filters, or inspecting the exhaust vent. Always turn off power and gas before attempting any repair.
High-Severity Rheem Error Codes
These codes indicate conditions that prevent normal furnace operation or involve safety-relevant components such as the gas valve, heat exchanger, or inducer motor. Most require a licensed HVAC technician to diagnose and repair safely.
About Rheem
Rheem Manufacturing was established in 1925 by brothers Richard and Donald Rheem in Richmond, California, with financial support from their brother William. The company began as a manufacturer of galvanized steel drums and was formally organized on January 22, 1930, after acquiring Pacific Galvanizing. In 1960, Rheem acquired the Ruud brand.
Pace Industries acquired Rheem in 1984, and in 1988, Paloma Ltd., a privately held Japanese firm headquartered in Nagoya, purchased Pace Industries. Today, Rheem operates as an independent subsidiary of Paloma Industries. The company has continued to expand through acquisitions, including Intergas (2019), Friedrich Air Conditioning (2021), DeJong (2022), and Nortek Global HVAC (2024).
Rheem in the Furnace Market
Rheem is headquartered in Atlanta, Georgia, with approximately 14,000 employees and roughly $6 billion in annual revenue as of 2022. By 2008, the firm ranked fifth nationally in central air conditioners and heat pumps with 12% market share, and similarly fifth in residential gas furnaces. The company operates under nearly 50 brands worldwide. Rheem pioneered the use of scroll compressors throughout its residential HVAC lineup in 1994 and introduced glass-lining tank coatings in 1954.