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while a shift toward yellow warns of moisture contamination
If the motor has failed
Common Questions What are the symptoms of a failing Lennox 10P29
or improper heat strip staging that forces temperatures above the 117°C limit
York S1-025-31834-000 Limit Switch while a shift toward yellowThe York S1 025 31834 000 Limit Switch is a critical OEM safety component engineered for narrow tolerance thermal protection in York HVAC systems. As a manual reset (M R) limit switch, this device is designed to interrupt the electrical circuit and lock out the ignition sequence if internal temperatures exceed the 160F open temperature setpoint. This ensures the unit does not attempt to recycle under unsafe conditions, protecting the heat exchanger