Ruud Furnace Error Codes
A sister brand to Rheem, sharing the same furnace technology and error code systems.
How Ruud Furnaces Display Error Codes
The Integrated Furnace Control (IFC) uses Bluetooth communicating fault codes displayed via the contractor app. Codes use alphanumeric format with A (Active fault) or T (Transient fault) prefix followed by a 3-digit number and _F suffix. Active faults indicate a currently present condition; transient faults indicate an intermittent condition. Codes marked with * are two-stage only faults. All lockout conditions can be cleared by cycling power off and then back on. The furnace control will not initiate a heat cycle during any lockout condition.
This site covers 4 Ruud 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.
Ruud Furnace Models
DIY-Friendly Ruud Error Codes
These error codes on Ruud 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 Ruud 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 Ruud
Ruud's origins predate its sister brand Rheem by nearly three decades. Norwegian immigrant Edwin Ruud founded the company in Pittsburgh, Pennsylvania in 1897, and his development of the first automatic storage tank gas-fired water heater—which entered production as early as 1889—helped establish Ruud as a pioneer in home comfort technology. Rheem Manufacturing Company, founded in 1925 by brothers Richard and Donald Rheem in Richmond, California, acquired Ruud in 1960, combining two of the industry's most recognized names under one corporate roof. Since 1988, the combined company has operated as an independent subsidiary of Paloma Industries, a privately held Japanese manufacturer headquartered in Nagoya. Today, Ruud sells heating, cooling, and water heating equipment through a nationwide network of licensed contractors and wholesale distributors, with corporate operations based in Atlanta, Georgia.
Ruud in the Furnace Market
Ruud serves the contractor and wholesale channel as Rheem's dedicated trade brand, sharing the same underlying equipment platform and manufacturing facilities. The brand targets professional installers and HVAC contractors through its MyRuud portal and business parts network. By 2008, the Rheem/Ruud platform had captured approximately 12% of the U.S. central air conditioner and heat pump market, ranking fifth nationally. Consumer Reports recognized the platform in 2009 for having the fewest percentage of units requiring repair among major HVAC brands.