60M61 – ROLLOUT SWITCH

Flame rollout switch – a safety control that trips when flames roll out of the burner box, cutting the gas valve circuit. A trip always signals a real fault such as a blocked heat exchanger, plugged flue or failed inducer, so find and fix the cause before resetting. Never jumper a rollout switch or fit a different temperature rating. Lennox / Allied Air lists this number but publishes no spec sheet, so no trip temperature or amp rating is quoted here.

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

Specs

• TypeFlame rollout switch
• OEM brandLennox / Allied Air
• Trip temperatureNot published by the OEM - read the stamping on the switch
• ResetManual reset is typical of rollout switches - verify on the part
• ContactsNormally closed, open on rollout
• Data SourceOTP stock record - not manufacturer-verified

Cross-reference numbers

This part replaces the following OEM and aftermarket numbers:

• 42W94

Not sure if your number matches? Call (214) 340-9421 or bring the old part in — bench-testing is free.

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.