What are the specs for this Limit Switch?

The correct replacement for Goodman model GMNT120-5B — B1370254 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 GMNT120-5B — B1370254.

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 Stack Overtemp Limit Switch for GMNT120-5B — B1370254

Name: OEM Goodman Stack Overtemp Limit Switch for GMNT120-5B — B1370254
Brand: Goodman
SKU: GOODMAN-11759
Price: 13.95 USD
Availability: InStock

SKU: GOODMAN-11759 Brand: Goodman

$13.95 $17.95

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Goodman B1370254 Stack Overtemp Limit Switch

The Goodman B1370254 is a genuine OEM stack (flue) overtemp limit switch, engineered as a direct-fit replacement for the GMNT120-5B gas furnace. The stack overtemp switch monitors temperature at the vent/collector box and trips if flue gases run abnormally hot — a condition often caused by a blocked vent, restricted heat exchanger, or improper combustion. By cutting the gas circuit, it protects the vent system and heat exchanger from heat damage and helps guard against unsafe venting.

Specifications

Type: stack / flue overtemp limit switch
Function: opens on excessive vent temperature
Reset: automatic reset on cool-down
Terminals: 1/4 in. spade connections
Fits: Goodman GMNT120-5B furnace
OEM part number: B1370254

OEM vs. Generic

This genuine OEM Goodman switch is matched to the exact trip point and mounting location of your furnace's flue system. Generic overtemp switches may carry the wrong calibration or bracket, undermining a safety function that directly affects venting integrity. For flue-related safety controls, the factory-spec part is strongly recommended.

Installation Difficulty

Easy (2/5). Disconnect power, unplug the two spade terminals, remove the mounting screws at the collector box or vent, and install the new switch. Frequent tripping usually points to a venting or combustion problem — inspect the flue, inducer, and heat exchanger before replacing the switch.

Fits Goodman GMNT120-5B. Disconnect power before servicing.

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 Stack Overtemp Limit...

$13.95

Frequently Asked Questions

Does this Limit Switch fit my Goodman GMNT120-5B — B1370254?

Yes. This is the factory-specified OEM limit switch for the Goodman GMNT120-5B — B1370254. 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 GMNT120-5B — B1370254?

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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