{"product_id":"lennox-26w42-genuine-oem-2-stage-pressure-switch-0-95-0-55-w-c-101126-03-on-line-only","title":"Lennox 26W42 – Genuine OEM 2-Stage Pressure Switch (0.95\" \/ 0.55\" W.C., 101126-03) On-Line Only","description":"\u003ch1\u003eLennox 26W42 – Genuine OEM 2-Stage Pressure Switch (0.95\" \/ 0.55\" W.C., 101126-03)\u003c\/h1\u003e\n\u003cp\u003eThe \u003cstrong\u003eLennox 26W42\u003c\/strong\u003e (Model \u003cstrong\u003e101126-03\u003c\/strong\u003e) is a high-precision \u003cstrong\u003eGenuine OEM 2-Stage Pressure Switch\u003c\/strong\u003e designed for Lennox and Armstrong Air high-efficiency gas furnaces. This dual-action safety device monitors the combustion air pressure generated by the inducer motor, ensuring that exhaust gases are being properly vented at both low-fire and high-fire stages before the gas valve is permitted to open.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eTechnical Performance:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eEngineered specifically for two-stage heating systems, this switch features two distinct calibrated set points: a \u003cstrong\u003eLow-Stage set point of 0.55\" W.C.\u003c\/strong\u003e and a \u003cstrong\u003eHigh-Stage set point of 0.95\" W.C.\u003c\/strong\u003e. This ensures that the furnace operates safely across varying inducer speeds. If the venting system becomes restricted or the inducer motor underperforms at either stage, the switch will break the 24V control circuit, instantly shutting down the ignition process to prevent a carbon monoxide hazard.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eKey Features and Function:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFeature 1: Dual-Stage Pressure Monitoring:\u003c\/strong\u003e Specifically calibrated to manage the safety requirements of both low-heat and high-heat cycles.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFeature 2: Precision Calibration:\u003c\/strong\u003e Set at 0.55\" and 0.95\" Water Column (W.C.) to maintain strict factory-specified venting tolerances.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFeature 3: Fail-Safe Safety Integration:\u003c\/strong\u003e Normally-open contacts ensure the furnace cannot fire if the inducer fan is not creating a sufficient vacuum.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFeature 4: Corrosion-Resistant Diaphragm:\u003c\/strong\u003e Built with high-grade internal components to resist the moisture and acidic condensate found in 90%+ AFUE furnace vents.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eProduct Details and Key Specifications:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCatalog Number:\u003c\/strong\u003e 26W42\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel\/Part Number:\u003c\/strong\u003e 101126-03\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Lennox \/ Allied Air (Genuine OEM)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Type:\u003c\/strong\u003e 2-Stage Air Pressure Switch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Stage Set Point:\u003c\/strong\u003e 0.95\" W.C.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow-Stage Set Point:\u003c\/strong\u003e 0.55\" W.C.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 24 VAC Control Circuit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping Weight:\u003c\/strong\u003e 0.4 lbs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e🛠️ \u003cstrong\u003eHVAC Depot Pro Tip: The \"Blocked Drain\" Logic\u003c\/strong\u003e\n\u003c\/h2\u003e\n\u003cp\u003eIn high-efficiency furnaces, a tripped 26W42 switch doesn't always mean the inducer or switch is bad. Often, a clogged condensate drain line will back up water into the inducer housing, blocking the pressure signal. Before replacing the switch, blow through the pressure tubing and check your furnace's trap and drain lines for clogs that might be causing \"nuisance\" trips.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eCross-Reference \u0026amp; Compatibility:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003e26W42\u003c\/strong\u003e is a direct OEM replacement for the following part numbers:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Numbers:\u003c\/strong\u003e 101126-03, 10112603, 26W4201, 101126-01\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndustry Refs:\u003c\/strong\u003e MPL-9300-V-0.55\/0.95-DEB\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eExtensive Model Compatibility List:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLennox G61MPV Series:\u003c\/strong\u003e G61MPV-36B-070, G61MPV-36C-090, G61MPV-60C-090, G61MPV-60D-135\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLennox G60UHV Series:\u003c\/strong\u003e G60UHV-36B-070, G60UHV-60C-090, G60UHV-60D-135\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eArmstrong Air \/ AirEase:\u003c\/strong\u003e 95% AFUE 2-Stage models matching 0.55\/0.95 specs.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HVAC Parts and Equipment Depot","offers":[{"title":"Default Title","offer_id":52783831810411,"sku":"101126-03","price":88.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0922\/9683\/9531\/files\/26W42.jpg?v=1769033625","url":"https:\/\/tophvacparts.com\/products\/lennox-26w42-genuine-oem-2-stage-pressure-switch-0-95-0-55-w-c-101126-03-on-line-only","provider":"HVAC Parts and Equipment Depot","version":"1.0","type":"link"}