York S1-3500-3121 Limit Switch L99H008 Key Benefits Factory Calibrated 170°F

Key Benefits Factory Calibrated 170°F Cut-out: Provides accurate thermal protection to prevent heat exchanger stress and potential cracks

Are the guard rods included with this specific model

Check for a blocked vent pipe

installing a carrier P506-8D48 is essential during liquid line or suction line service to prevent expansion valve freeze-ups and compressor failure

If the valve is energized but fails to open

York S1-3500-3121 Limit Switch L99H008 Key Benefits Factory Calibrated 170°FWhen you are troubleshooting a mid efficiency or high efficiency furnace that is short cycling or displaying a four flash diagnostic code, the York S1 3500 3121 Limit Switch is the OEM replacement part required to restore safe operation. This is a normally closed (NC) safety device calibrated for an opening temperature of 165F and a closing temperature of 105F. As a genuine Johnson Controls component, it is designed for drop in compatibility with