S1-02526366009 – LIMIT SWITCH

York / Coleman / Evcon OEM limit 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.

Specifications from our own stock records. The manufacturer does not publish a public page for this item.

Specs

• OEM brandYork / Coleman / Evcon (Johnson Controls)
• Part numberS1-02526366009
• Product typeLimit switch
• Temperature / set point ratingNot published by the OEM - read the marking on the part
• Electrical ratingNot published by the OEM
• Availability noteCurrent OEM service part
• Data SourceOTP stock record - not manufacturer-verified

What does L200-40 mean on a furnace limit switch?

L is limit, 200 is the temperature in F where the contacts open on a rise, and 40 is the differential, so it closes back around 160F. That is an auto-reset disc. Manual-reset limits have a button and stay open until somebody pushes it. Bring the old one in so we can match the temperature, the mounting hole pattern, and the probe length together.

My limit keeps tripping. Is the switch bad?

Usually not. A limit is a safety reading real heat, and most repeat trips we hear about trace back to airflow - a loaded filter, closed or blocked registers, an undersized return, a dirty blower wheel, or a plugged evaporator coil sitting above the heat exchanger. Check temperature rise against the nameplate range, often 40-70F or 45-75F. Rise above the top number means airflow, not a bad switch.

Can I use a hotter limit if that is what is in stock?

No. L200, L230, L250 and L290 differ only by trip temperature and by base or probe size, and they are not interchangeable. Dropping a hotter limit into a furnace that specced a cooler one lets the heat exchanger run past the temperature it was tested to. That is defeating the safety, not fixing it.

Does insertion length matter?

Yes. A 3 inch probe where 5 inch was called for sits in the wrong part of the airstream, reads low, and trips late or never. Measure the old probe from the back of the mounting plate to the tip.