Johnson Controls T-4000-2138 Plastic Cover this HVAC limit switch is

this HVAC limit switch is essential for resolving short-cycling or "blower always on" symptoms caused by a tripped or failing thermal sensor

Always verify your heater's model and serial number against the rating plate to ensure a match

ensuring durability in demanding mechanical rooms

Does the color of the coil matter during replacement

including the FG6RA series

Johnson Controls T-4000-2138 Plastic Cover this HVAC limit switch isThe Johnson Controls T 4000 2138 is a professional grade beige plastic thermostat cover designed specifically for T 4000 series pneumatic room thermostats. This field standard component provides a clean, streamlined aesthetic for commercial HVAC systems where tamper resistance and a minimalist profile are required. Engineered for versatility, the T 4000 2138 supports both horizontal and vertical mounting configurations, accommodating various pneumatic