Hearth & Home 3-20-6866 Differential Switch
Excluded Brands
The following brands are not eligible for LTI discount codes (including WELCOME). They go on sale only during manufacturer-authorized promotions:
- Gozney — pizza ovens and accessories
- OHCO — massage chairs
- Positive Posture — massage chairs and recliners
- Nomadix — outdoor lifestyle products (towels, blankets, accessories)
Excluded Products
The following individual products are also not eligible for discount codes:
- Any product that already has a price markdown — items on sale or clearance can't stack additional discounts on top
- FreshWater Salt System Replacement Cartridge (single)
- FreshWater Salt System Replacement Cartridge (3 Pack)
- Route Protection Insurance — third-party shipping protection, not eligible for our discounts
- Bullfrog A / R / X Series 10-00282 Filter Cartridges
- Bullfrog STIL Series 10-00281 Filter Cartridges
- FROG® @ease Sanitizer System for Bullfrog Spas
- FROG® @ease Replacement Cartridge for Bullfrog Spas (3 Pack)
- Bullfrog Simplicity™ Flat Filters for M Series (4 Pack)
- Filter Core Cage & Cap Assembly for Bullfrog Spas
- Fireplaces (gas, wood-burning, and fireplace inserts)
- Electric Fireplaces
- Gas Vent Pipe
- Pellet Vent Pipe
- Fireplace Fronts
This list can change. Manufacturers occasionally add or remove products from their MAP-protected lists. We update this page when they do, but the most accurate way to confirm whether a discount applies to a specific item is to add the item to your cart and try the code at checkout. If the code doesn't work, the item is excluded. If it does work, it's eligible.
Hearth & Home 3-20-6866 Differential Switch
Overview
The Hearth & Home Differential Switch (Part Number 3-20-6866) is a crucial pressure-sensitive component used in select pellet and gas stove models to monitor and regulate proper airflow and exhaust operation. This OEM part ensures that the combustion and venting systems are functioning safely by detecting differences in air pressure and enabling ignition only under the correct operating conditions. If a blockage or fan failure occurs, the differential switch helps prevent unsafe startup or operation. Built for durability and precision, the 3-20-6866 switch plays a vital role in maintaining efficient, safe performance in Hearth & Home Technologies appliances.
What’s in the Box
- 1 x Differential Switch
Recommended For
The Hearth & Home Differential Switch (Part Number 3-20-6866) is compatible with a range of Harman and Heatilator Eco-Choice pellet stove models. Below is a list of models that utilize this differential switch:​
Models
Harman: Absolute 43, Absolute 43-C, Absolute 63, Accentra FS, Accentra 52i, Accentra 52i-TC, Advance, Allure 50, HF60, P35i, P38, P43, P61, P61A, P68, PC45, PF100, PF120, PB105, XXV, XXV-TC
Heatilator: BH60, BH105, BA100
Brand
Hearth & Home®
