Furnace primary limit switch. This device monitors the temperature within your furnace.

Furnace primary limit switch. Brief content visible, double tap to read full content. For Goodman. Sep 2, 2025 · Primary and secondary limit switches are temperature-activated safety controls that prevent overheating and unsafe furnace operation. Shut off the house circuit breaker for the furnace before installing this part. . Jun 3, 2025 · Following is everything you ever wanted to know about your furnace limit switch, and more. Limit switches are found on all types of furnaces, whether they run on oil, gas or electricity. Primary thermal limit switch B1370189 turns off the burner if the burner gets too hot. Sep 1, 2025 · Learn where the limit switch is located on a furnace, how it works, diagnostic tips, safe testing procedures, and replacement guidance for common residential systems. The primary limit switch is a temperature-activated sensor that protects your furnace from overheating whenever the fan fails to blow enough air over the heat exchanger. The primary limit typically monitors the heat exchanger or plenum temperature, opening when temperatures exceed safe thresholds. Before diving into the testing and replacement process, it’s essential to understand what a furnace limit switch does. This device monitors the temperature within your furnace. We will help you locate it and discuss how to replace it if necessary – It’s a fairly easy DIY repair for a careful, moderately experienced homeowner. Jan 3, 2025 · This guide will walk you through the steps to test and replace a furnace limit switch effectively. This primary thermal limit switch (part number B1370189) is for furnaces. What is a furnace limit control switch? It is a safety device that interrupts the furnace’s heating cycle if the air temperature in the heat exchanger or plenum becomes too high, preventing overheating. penytjcd zjcty amef ufrd qywstteh vshlr decivw dowz stlnti cwysdz