Trane KIT15943 IFC Kit 30067439-890 If the furnace is locked

If the furnace is locked out on a high-limit code

meaning the branch line pressure increases as the sensed temperature rises above the setpoint

this HVAC defrost board eliminates common issues like short-cycling or improper frost detection by utilizing a precise sensing element that responds to low-temperature cutout conditions

maintaining a Max Operating Pressure (MOP) of 667 PSI

Trane KIT15943 IFC Kit 30067439-890 If the furnace is lockedThe Trane KIT15943 IFC Kit is a critical integrated furnace control (IFC) assembly designed for precise management of heating cycles and blower timing in specific Trane and American Standard residential furnaces. This kit serves as the direct OEM replacement for legacy control boards CNT3077 and CNT5122, ensuring electrical and logic compatibility without the need for field modifications. The assembly includes a replacement ignitor and a complete