Trane Furnace Error Codes
A premium HVAC brand known for reliability and durability, part of Trane Technologies.
How Trane Furnaces Display Error Codes
The Integrated Furnace Control (IFC) has a diagnostic LED that communicates furnace status and error conditions through flash patterns. A slow flash indicates normal standby, a fast flash indicates an active call for heat, and numbered flash sequences (2 through 9) indicate specific fault conditions.
This site covers 2 Trane furnace models and a total of 24 error code entries. Select your model below to see the full code list with causes and repair guidance.
Trane Furnace Models
DIY-Friendly Trane Error Codes
These error codes on Trane 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.
| Code | Fault | Models |
|---|---|---|
| Continuous OFF | Check Power | 2 models |
| 4 Flashes | Open Temperature Limit Circuit | 2 models |
High-Severity Trane 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 Trane
The Trane brand traces its origins to 1885 when James Trane, a Norwegian immigrant, opened a plumbing and pipe-fitting shop in La Crosse, Wisconsin. His son Reuben joined the business in 1910, and together they incorporated The Trane Company in 1913, shifting focus toward heating products. Reuben's 1923 invention of the convector radiator was a breakthrough that displaced cast-iron radiators of the era, and the company introduced its first air conditioning unit in 1931. American Standard Companies acquired Trane in 1984. After American Standard dissolved in 2007, Ingersoll Rand acquired Trane, completing the deal in June 2008. In 2020, Ingersoll Rand spun off its non-refrigeration businesses and rebranded as Trane Technologies, refocusing the company exclusively on HVAC and transport refrigeration.
Trane in the Furnace Market
Trane is one of the largest HVAC brands globally, operating under Trane Technologies, which generated $21.3 billion in revenue in 2025 with 44,000 employees worldwide. Trane offers a comprehensive residential and commercial product lineup including furnaces, air conditioners, heat pumps, ductless systems, and smart thermostats. The brand is known for durable aluminum coil construction, advanced air purification removing up to 99.98% of airborne particles, and smart home integration through the Trane Home App. Trane Technologies has been recognized on Fortune's World's Most Admired Companies list for fourteen consecutive years.