S1-7670-3531 – DOOR SWITCH (OBSOLETE, NO REPLACEMENT)

York / Coleman / Evcon OEM door interlock switch. Johnson Controls does not publish public specification sheets or cross-references for its York and Source 1 service parts, so no temperature rating, set point or amperage is listed here. Parts in this group are safety controls – match the part number exactly rather than substituting by appearance, and confirm the rating stamped on the original before installing. Our records note this part as obsolete with no factory replacement.

Specs

• OEM brandYork / Coleman / Evcon (Johnson Controls)
• Part numberS1-7670-3531
• Product typeDoor interlock switch
• Temperature / set point ratingNot published by the OEM - read the marking on the part
• Electrical ratingNot published by the OEM
• Availability noteObsolete, no factory replacement
• Data SourceOTP stock record - not manufacturer-verified

What does the blower door switch do?

It is an interlock. With the blower door off, the switch opens and drops power to the blower, and on a lot of furnaces to the control board as well. Most are line voltage rated. It keeps hands out of a spinning blower wheel, and it keeps the blower from running with the burner compartment open where it could pull combustion products into the return.

My furnace quit the second I closed the panel. Where do I look?

At the switch and at the door itself. The panel has to seat far enough to push the plunger in, so check for a bent plunger, a door hung up on a screw or on wiring, a bracket knocked out of position, or a switch simply worn out from being cycled every time somebody changed a filter. If holding the plunger in by hand brings the furnace back, you found it.

Is it OK to tape the plunger down?

Common, and still a bad idea. Hold it in with your finger while you are watching the burners light, then let it go when you are done. Leaving it defeated means the next person to open that panel does it on a running blower, and it hides a door that is not seating.

Are door switches universal?

Close, not quite. Match the action (plunger or lever), whether it rests open or closed, the voltage rating, and the mounting hole spacing. Bring the old one in and we will lay it next to what we stock.