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If the valve is energized but fails to open
Key Benefits Factory Calibrated 170°F Cut-out: Provides accurate thermal protection to prevent heat exchanger stress and potential cracks
ensuring the unit operates within its designed technical parameters without the integration issues common in aftermarket alternatives
System Compatibility: Drop-in replacement for Nor East and Honeywell V5011 valves ranging from 2-1/2 to 6 inches
Direct Replacement: Serves as the official Lochinvar OEM part for discontinued or failing 316158-000 and 9007601005 control kits
York S1-3500-3121 Limit Switch L99H008 If the valve is energizedWhen 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