Photo may vary slightly — verify by part number before ordering.York S1-6421652 Circuit Board, SSE, 2 Stage, with C | OEM Source 1 Part
Some parts ship faster than shown. Confirm the exact lead time or email the parts desk.
Not sure it's the right part? Send the model and serial — help@totalhvacparts.com or 302-219-4994.
Overview
York Source 1 part S1-6421652: Circuit Board, SSE, 2 Stage, with C. Source 1 is the York/Johnson Controls (JCI) parts brand for York, Coleman and Luxaire residential and light-commercial furnaces, air handlers and condensing units. Used in York, Coleman and Luxaire furnaces, air handlers and condensing units; confirm by the part number on the existing board.
Why buy from Total HVAC Parts: Genuine York Source 1 OEM parts, supplied through authorized York OEM channels. Full manufacturer warranty applies. Need help confirming fit? Send us your unit's model and serial number before you order.
Shipping: Ships same or next business day. Free shipping on orders over $50; flat-rate shipping under $50. Returns follow our standard parts return policy.
Specifications
| York / Source 1 part number | S1-6421652 |
| Also searched as | 6421652 |
| Description | Circuit Board, SSE, 2 Stage, with C |
| Category | Control boards |
| Brand | York / Source 1 (Johnson Controls) |
After You Order
Order number and confirmation by email the moment you check out.
Lead time may apply — ships from our warehouse or York's warehouse. We email you the ship date once it's confirmed; ask the parts desk first if timing matters.
Tracking number lands in your inbox the moment it leaves the building.
Check the part number on the label against your order before installing. Wrong or damaged? Tell us — we'll sort it out.
Ask the Parts Desk
Not sure this fits? Need more than what's in stock? Send the model and serial from the unit's data plate — a real person reads it and confirms before you order.
Common Questions
Is the stock number on this page real?
Right now there's no stock of S1-6421652 on our shelf or in York's parts warehouses (checked daily, last on Oct 27, 2026), so the page says lead time may apply. It ships from our warehouse or York's warehouse; you can still order it, and the parts desk can give you a date first if timing matters.
Is this a genuine York part, or aftermarket?
Genuine York OEM equipment sourced through York's authorized parts program — not an aftermarket substitute.
How do I confirm this fits my unit?
Match part number S1-6421652 to your unit's parts diagram. If unsure, send us your model and serial number and we'll verify before you order.
I see this listed under a different name on other sites. Is it the same part?
Yes — manufacturers and distributors sometimes use different brand names or legacy labels for the same part number. Part number S1-6421652 is identical across all name variations.
What's the warranty on this part?
Warranty terms vary by manufacturer. Contact us with your order number for details specific to this part.
How fast does this ship?
Lead time may apply to this part: it ships from our warehouse or York's warehouse once it's in. Ask the parts desk for a date before you order. In-stock items ship the same business day on orders placed before 1pm ET, Monday–Friday. Standard ground delivers to most of the continental US in 2–5 business days. Ships via UPS/FedEx Ground, or truck freight for oversized items. Free standard shipping (US).
Does everything ship UPS or FedEx Ground?
Most orders ship UPS or FedEx Ground. A small number of large or heavy parts across the catalog ship by truck freight instead, and we reach out to arrange a delivery window before those orders leave the warehouse. Oversized items that ship by truck freight are also covered by free standard shipping on orders of $50 or more.
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Not sure it's the right part? send us the model and serial — help@totalhvacparts.com or 302-219-4994.