The first zone to call determines the mode

This kit is designed to facilitate the proper venting of combustion gases by creating a controlled pressurized environment within the heat exchanger

Will this sensor fix a "limit switch open" or "pressure switch" fault

Since it is a normally closed switch

you must use the 316 stainless steel bellows models specifically rated for ammonia service

Advanced Distributor Products 76717100 Limit Switch 320788-703 The first zone to callThe Advanced Distributor Products 76717100 L160 30F Limit Switch is a critical OEM replacement part engineered for high precision thermal protection in residential and commercial heating systems. This L160 30F high limit switch is designed to open at 160F and close once the temperature drops by a 30F differential, preventing heat exchanger damage and ensuring furnace safety sensor reliability. As a genuine ADP HVAC component, the 76717100 offers