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Condition:
Brand NewBrand New
The HH18HA416 is a normally closed switch that is designed to open at a specific temperature, usually around 200°F (93°C). Gently pull the switch out of the furnace and disconnect the wires. Turn the power back on to the furnace and test the new limit switch by running the furnace and monitoring the temperature.
Installed on my carrier MX series furnace works well still didn't fix shutting down needed new heat transfer the exhaust of the furnace smelled of eggs ... Replaced furnace for $600 more than repair was going to be hope this helps somebody ...