Limit Switches
HVAC limit switches are safety components used in HVAC systems that monitor temperature and ensure the system operates within safe temperature thresholds. If it detects temperature has exceeded safe operating limits, it will shut the unit down to prevent other damage and costly repairs. Limit switches are also commonly known as high-limit switches or temperature safety switches....Read more
Specifically, HVAC limit switches detect excessive heat in HVAC systems like furnaces, AHUs (air handlers), and boilers, then interrupt the power to the burner or heating element to prevent overheating. Overheating can lead to thermal damage, fire hazards, or sensitive component damage or failure such as heat exchangers and burners. These consequences are all are dangerous to occupants and come with expensive replacement or repair costs. As they are vital to safety, limit switches are often necessary to meet building code requirements.
LONG PartsPros stocks OEM-compatible limit switches with reliable thermal sensors to reduce false shutdowns and long-term durability for high-heat environments. It’s best to inspect limit switches during routine maintenance and ensure the switch is not triggering false shutdowns. Dust, corrosion, and heat exposure can affect HVAC limit switches overtime, so be sure to stock up on replacement parts to ensure the safe operation of your HVAC systems from trusted brands like Trane and Daikin.