What are the specs for this Limit Switch?

The correct replacement for Goodman model GMNT120-5B — B1370145 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 — B1370145.

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 300°F Rollout Limit Switch for GMNT120-5B — B1370145

Name: OEM Goodman 300°F Rollout Limit Switch for GMNT120-5B — B1370145
Brand: Goodman
SKU: GOODMAN-11756
Price: 4.95 USD
Availability: InStock

SKU: GOODMAN-11756 Brand: Goodman

$4.95 $6.49

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Goodman B1370145 300°F Rollout Limit Switch

The Goodman B1370145 is a genuine OEM flame-rollout limit switch rated to open at 300°F, engineered as a direct-fit replacement for the GMNT120-5B gas furnace. The rollout switch is a critical safety control mounted on the burner assembly. If flames roll out of the burner box — typically due to a blocked heat exchanger, cracked cell, or poor venting — this switch trips and cuts power to the gas valve, preventing fire and overheating damage.

Specifications

Trip temperature: 300°F (open on rise)
Type: flame rollout safety limit switch
Reset: manual reset
Terminals: standard 1/4 in. spade connections
Fits: Goodman GMNT120-5B furnace
OEM part number: B1370145

OEM vs. Generic

This genuine OEM Goodman switch is calibrated to the exact 300°F trip point specified for your furnace. Generic rollout switches with incorrect trip ratings can either nuisance-trip during normal operation or fail to protect the unit. For a safety-critical control, always match the factory temperature rating and reset style.

Installation Difficulty

Easy (2/5). Remove power, unplug the two spade terminals, unscrew the switch from the burner bracket, and install the replacement. A repeatedly tripping rollout switch signals a combustion problem — inspect the heat exchanger and venting before assuming the switch itself has failed.

Fits Goodman GMNT120-5B. Always cut power at the breaker 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 300°F Rollout Limit ...

$4.95

Frequently Asked Questions

Does this Limit Switch fit my Goodman GMNT120-5B — B1370145?

Yes. This is the factory-specified OEM limit switch for the Goodman GMNT120-5B — B1370145. 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 — B1370145?

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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