B1370155 – HIGH TEMPERATURE LIMIT SWITCH (DISC, DEEP BACK, L120°)

High-temperature limit switch for Goodman/Amana equipment, recorded as a disc-type switch with a deep back and an L120 degree F opening point. It breaks the control circuit when its sensing disc reaches the set temperature, protecting the cabinet and heat exchanger from over-temperature operation. The deep-back body style determines how the switch sits in its mounting opening, so confirm the physical profile as well as the temperature rating. Goodman/Daikin publishes no public part detail, so the specifications below come from our own stock records; confirm against the part nameplate before installing.

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

Before you order

Goodman’s own name for this part is AUXILIARY LIMIT SWITCH 120F — it is the blower-compartment auxiliary limit (L120-30F, auto reset), not a flame rollout switch and not the primary high limit. Some listings elsewhere mislabel it as a rollout. Make sure you are replacing the right switch. Published application data. Always match the full model and serial number on your unit before ordering.

Specs

• Part NumberB1370155
• Brand (as recorded)Goodman
• Product TypeHigh temperature limit switch
• StyleDisc, deep back
• Limit SettingL120 degrees F
• FunctionOpens control circuit on over-temperature
• Data SourceOTP stock record - not manufacturer-verified

Fits these models

• AMH80453 / 80703 / 80704 / 80903 / 80904 / 80905 / 81155 / 81405 series
• AMS80453 / 80703 / 80704 / 80903 / 80904 / 80905 / 81155 / 81405 series
• GMH80453 / 80703 / 80704 / 80905 / 81155 / 81405 series
• GMS80453 / 80703 / 80704 / 80903 / 80904 / 80905 / 81155 / 81405 series
• GME80704 / 80905 / 81155 series
• GDH80453 / 80703 / 80904 / 81155 series
• GDS80453 / 80703 / 80904 / 81155 series
• GHS80453 / 80704 / 80905 series
• DMS80453 / 80703 / 80704 / 80904 / 80905 / 81155 / 81405 series
• DDS80453 / 80703 / 80904 / 81155 series
• DHS80453, DHS80704, DHS80905
• ADS80453 / 80703 / 80904 / 81155 series
• ADV80703, ADV80905, ADV81155
• GDT045-3, GDT070-3, GDT090-4, GDT115-5
• GMP050-3, GMP075-3, GMP100-3, GMP100-4
• GMNT080-4
• CPG / DCG / DSG / DTG packaged gas 036 and 048 series

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.