What are the specs for this Limit Switch?

The correct replacement for Goodman model GMNT100-4B — B1370155 is this exact part. It is the factory-specified replacement with exact OEM specifications. Using a part with different specifications can cause equipment damage or void your warranty. You can verify this by checking the data plate on your Goodman equipment which lists the model number GMNT100-4B — B1370155.

What symptoms indicate I need a new limit switch?

Common symptoms that indicate you need a new limit switch include unusual noises, intermittent operation, complete failure to operate, or visible damage. For specific diagnostic guidance, visit nationalhvacparts.com/pages/hvac-diagnostic.

Is this limit switch compatible with Bryant or Payne systems too?

Many Goodman parts are cross-compatible with Bryant and Payne systems since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across multiple brand labels with different model numbers. To verify cross-compatibility, check your Bryant or Payne equipment service manual for cross-compatible part numbers, or contact info@nationalhvacparts.com with your model number for confirmation.

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Goodman

OEM Goodman 120°F Auxiliary Limit Switch for GMNT100-4B — B1370155

Name: OEM Goodman 120°F Auxiliary Limit Switch for GMNT100-4B — B1370155
Brand: Goodman
SKU: GOODMAN-11729
Price: 11.96 USD
Availability: InStock

SKU: GOODMAN-11729 Brand: Goodman

$11.96 $15.95

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OEM Goodman B1370155 Auxiliary Limit Switch (120°F)

The Goodman B1370155 is a genuine OEM 120°F auxiliary high-limit switch for GMNT100-4B gas furnaces. Typically mounted near the blower compartment, this auxiliary limit provides secondary over-temperature protection, opening the control circuit and stopping the burners if temperatures in the cabinet exceed safe levels — for example, during blower failure or severe airflow restriction. It backs up the primary limit for an added layer of safety.

Specifications

Trip temperature: 120°F
Type: Auxiliary/secondary high-limit safety switch
Contacts: Normally closed, opens on over-temp
Reset: Auto-reset on cool-down (verify vs. original)
Fits: Goodman GMNT100-4B and compatible Amana furnaces
OEM Part Number: B1370155

OEM vs. Generic

The 120°F set point and bracket are model-specific. The OEM B1370155 ensures the correct calibration and fit so the auxiliary limit protects as designed. Generic limits with different set points can cause nuisance lockouts or inadequate protection. For a safety control, choose OEM.

Installation Difficulty

Easy (2/5). Shut off power, remove the two spade terminals and mounting screws, and install the replacement in the same location and orientation. About 10 minutes. If it keeps tripping, correct the airflow or blower problem rather than defeating the switch.

Genuine Goodman/Amana OEM safety part for the GMNT100-4B series.

Shipping Information

Orders placed before 3PM CST ship same business day
Standard delivery: 2-5 business days
Express shipping available at checkout
Free shipping on orders over $75
Tracking number emailed upon shipment

Return Policy

30-day returns on unused parts in original packaging
Electrical parts (capacitors, contactors, control boards) are final sale once installed
Email info@nationalhvacparts.com to initiate a return
Refunds processed within 5-7 business days

OEM Goodman 120°F Auxiliary Limi...

$11.96

Frequently Asked Questions

Does this Limit Switch fit my Goodman GMNT100-4B — B1370155?

Yes. This is the factory-specified OEM limit switch for the Goodman GMNT100-4B — B1370155. It is a direct drop-in replacement that fits without modification. Always verify the model number on your equipment nameplate before ordering.

How do I replace the limit switch on my Goodman GMNT100-4B — B1370155?

Refer to your equipment service manual for model-specific steps. General approach: turn off power, photograph connections, remove old part, install new part, restore power and test. For gas components, hire a licensed technician. Email info@nationalhvacparts.com for guidance.

What symptoms mean I need a new limit switch?

Common symptoms: unusual noises, intermittent operation, complete failure, or visible damage. Visit our diagnostic hub for symptom-based troubleshooting.

Is this limit switch compatible with Bryant or Payne too?

Many Goodman parts are cross-compatible with Bryant and Payne since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across brand labels with different model numbers. To verify: check your Bryant or Payne equipment service manual for cross-compatible part numbers, or email info@nationalhvacparts.com with your model number.

Should I use OEM or aftermarket for my Goodman limit switch?

OEM recommended for reliability and warranty compatibility. OEM parts match exact factory specifications for proper fit, performance, and safety. While aftermarket alternatives cost less upfront, the risk of improper fit and reduced lifespan usually makes OEM the better value long-term.

How fast does National HVAC Parts ship?

Orders placed before 3:00 PM CST ship the same business day. Standard delivery is 2–5 business days anywhere in the continental United States. Express shipping available at checkout. We ship from Houston, TX to all 50 states. 30-day return policy on all parts.

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