02532607000 – HIGH LIMIT SWITCH

York / Coleman / Luxaire auto-reset high limit switch with a 3 in. insertion probe. It opens at 185°F on temperature rise and recloses at 155°F. Johnson Controls catalogs it as “SWITCH, LIMIT, 185/155 (O/C), AUTO RESET.”

Our stock record carries this as 02532607000. That is the underlying York number; S1- is simply the Source 1 selling prefix, so S1-02532607000 and 025-32607-000 are the same switch. Note that at least one retailer publishes this part as a 165°F limit — that contradicts the Johnson Controls catalog, and we do not repeat it. This is a safety control: match the part number exactly rather than substituting by appearance, and confirm the rating stamped on the original before installing. Manufacturer catalog listing.

Specs

• Full Source 1 numberS1-02532607000
• Base York / JCI number025-32607-000
• Opens on rise185°F
• Closes on fall155°F
• ResetAutomatic
• Insertion length3 in.
• ApplicationLimit control

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.