Harman Vacuum Switch, Absolute, Accentra, Advance, P35i, P43, 52i,

HARMAN & HEATILATOR PRESSURE SWITCH

Highest Quality Aftermarket Replacement Harman and Heatilator Eco-Choice vacuum differential switch for part numbers 3-20-6866 and SRV8320-003. The replacement vacuum differential switch is used in all Harman pellet stove models, the Harman Mark I coal stove model, and Heatilator Eco-Choice boiler and furnace models including the BA100, BH105, BH60, and BIO-120.

Also referred to as the negative pressure switch or low draft switch, the vacuum differential switch senses air pressure in the firebox and exhaust flue vent pipe. The vacuum switch is in-line with the auger feed motor and will not allow the auger motor to run if it is tripped or faulty. Any air losses or air blockages can trip the vacuum switch. When experiencing issues with this safety switch, check the following: vacuum switch hose/tubing, firebox door and ash door gasket seals, ash accumulation in the stove or venting, air intake channel, combustion blower/exhaust fan functionality. 

OEM Quality Vacuum Pressure Differential Switch

Guaranteed Newest Stock Inventory

1 Year Manufacturer Warranty

Included: Vacuum Switch Sensor Only. Please see our related listings for the replacement hose.

Function: This Vacuum Sensor Pressure Switch detects pressure in the exhaust chamber and vent piping as well as the firebox and fuel hopper. This switch will shut down the auger feed motor if the exhaust is blocked, exhaust fan is weak, ash blockage in the unit or venting, gasket seals are not tight around the door, ash pan or fuel hopper lid.

Harman Pellet

• Absolute 43
• Absolute 63
• Accentra 52I
• Accentra 52i-TC
• Accentra FS (Accentra Cast)
• Accentra Insert
• Advance
• Allure 50
• HydroFlex 60 (HF60) Boiler
• P35I Insert
• P38 (P38+, PP38+)
• P43
• P61
• P61A
• P68
• PB105 Boiler
• PC45
• PF100 Furnace
• PF120 Furnace
• XXV (25th Anniversary Model)
• XXV-TC

Harman Wood & Coal

• Mark I

Heatilator Pellet

• BA100
• BH105
• BH60
• BIO-120

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• Returns accepted within 30 days on products not used or installed

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