If the furnace blower runs continuously while the burners remain off

it provides a direct mechanical interface for the Crathco Classic Bubbler series

It is compatible with a wide range of Heil

If the coil is energized but there is no continuity between the line and load terminals on the 30A side

Carrier HH19ZA140 Limit Switch If the furnace blower runsThe Carrier HH19ZA140 Limit Switch is a high precision safety component engineered for HVAC systems requiring an L140 40F thermal threshold. Designed with a normally closed circuit, this disc style switch is rated to open on a temperature rise at 140F and automatically reset when the temperature drops to 100F. As an OEM replacement part, it ensures seamless integration and maintains the original equipments safety ratings and system efficiencies. The