What are the specs for this Limit Switch?

The correct replacement for Goodman model GMNT100-4 — 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 GMNT100-4 — 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 GMNT100-4 — B1370145

Name: OEM Goodman 300°F Rollout Limit Switch for GMNT100-4 — B1370145
Brand: Goodman
SKU: GOODMAN-11721
Price: 4.95 USD
Availability: InStock

SKU: GOODMAN-11721 Brand: Goodman

$4.95 $6.49

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Goodman B1370145 Flame Rollout Switch — 300°F

The B1370145 is a genuine OEM 300°F flame rollout limit switch for the Goodman GMNT100-4 gas furnace. This is a safety-critical component: it monitors the burner area for flame rollout caused by a blocked flue, cracked heat exchanger, or restricted combustion air, and shuts down the furnace before an unsafe condition develops. A tripped or failed rollout switch is a common cause of a furnace that lights briefly then locks out on "no heat."

Specifications

Trip temperature: 300°F
Reset: Manual reset button
Function: Flame rollout safety limit
Compatible model: Goodman GMNT100-4
OEM part number: B1370145
Brand: Goodman (genuine OEM)

OEM vs. Generic

Because this is a safety device, we strongly recommend the genuine OEM B1370145 — it is calibrated to the exact 300°F trip point the furnace control expects. Generic 300°F switches exist but should match trip temperature, mounting, and terminal style precisely; never substitute a different temperature rating on a safety limit.

Installation Difficulty: Easy

A quick two-wire, single-fastener swap. Shut off power and gas, unplug the two terminals, remove the mounting screw, and install the replacement. Important: if a rollout switch has tripped, diagnose and correct the root cause (flue blockage, heat exchanger, combustion air) before returning the furnace to service.

Fits Goodman GMNT100-4. In stock and ready to ship.

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 GMNT100-4 — B1370145?

Yes. This is the factory-specified OEM limit switch for the Goodman GMNT100-4 — 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 GMNT100-4 — 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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