Vacuum Switch Replacement

Vacuum SwitchEnsure safe airflow monitoring and reliable appliance operation with this replacement vacuum switch, equivalent to multiple Harman OEM part numbers. Designed for compatible pellet and hearth heating systems, this switch verifies proper draft conditions to support safe ignition and continued operation.Key FeaturesEquivalent to Harman OEM vacuum switch replacementsSupports airflow and draft safety verificationHelps maintain safe startup and appliance performanceDirect-fit replacement for listed Harman part numbersSpecificationsOEM: HarmanReplaces OEM: 3-20-6866Equivalent To: 3-20-6866, 3-20-9301, 3-20-3433UPC: Not availableSKU: 20168Category: Hearth Parts (Switch)Direct Replacement ForHARMAN 559997HARMAN 1813875HARMAN 2703240Why Choose This ReplacementA malfunctioning vacuum switch can prevent ignition or cause unexpected shutdowns as a safety measure. This OEM-equivalent replacement helps restore accurate draft sensing and supports safe, dependable performance in Harman hearth appliances.Installation TipsDisconnect electrical power before servicing hearth appliance components.Confirm compatibility with your Harman model and part number references.Inspect vacuum tubing for cracks, blockages, or loose fittings during replacement.Ensure airtight hose connections to prevent false pressure readings.Test appliance startup cycle to verify proper switch operation.Pairs Well WithHarman combustion blowers, pellet stove vacuum tubing, hearth control boards, airflow safety switch componentsSpecial Order Notice: This item requires an additional 2–3 business days to process before shipping.