This 200 degree F limit switch is built to the exact specifications required for Heil

while the high limit adjustment allows for 3 psi above to 1 psi below supply pressure

The most common symptom is the inducer/venter motor starting

the MA40-7040-501 variation typically includes a built-in SPDT auxiliary switch

Nordyne 1017207 Relay Kit 319825-402 This 200 degree F limitThe Nordyne 1017207 Relay Kit is a crucial OEM component designed for high reliability switching in DC heater control applications. As a direct 9 pin SPST relay replacement, this kit ensures the electrical integrity of heating circuits in Nordyne, Miller, and Intertherm furnaces. Operating on a 24VDC coil voltage, this relay serves as the direct replacement for 622210R and 622671, addressing common failure points such as stuck contacts or intermittent