it should show 0 ohms at room temperature

in professional practice

which can interfere with the seal or contaminate the condensate return line

This automatic temperature limit switch operates within a fixed 170°F to 200°F range

Engineered for durability

Rheem-Ruud 42-105601-20 Pressure Switch it should show 0 ohmsThe Rheem Ruud 42 105601 20 Pressure Switch is an essential safety component designed for specific furnace and air handler applications. This single pole single throw (SPST) switch is factory calibrated to a 0. 45" WC set point, ensuring precise monitoring of combustion blower performance and venting integrity. As the direct replacement for 42 24335 20, this genuine OEM part maintains system UL certification and prevents furnace operation during