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as well as the UBX
Engineered for performance in unit heaters
it ensures the system shuts down immediately if flame rollout is detected
Common Questions: What are the symptoms of a failing Lennox 47K30 blower wheel
Carrier HH19ZA156 Limit Switch L99H008 as well as the UBXThe Carrier HH19ZA156 Limit Switch is a critical OEM safety component designed for precise thermal regulation within Carrier, Bryant, and Payne furnace assemblies. This normally closed disc style switch acts as a primary high limit safeguard, engineered to interrupt the electrical circuit and terminate the heating cycle when internal plenum temperatures reach the 155F open setpoint. Once the heat exchanger cools to the 105F close setpoint, the
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