What are the specs for this Limit Switch?

The correct replacement for Goodman model GMNT045-3B — 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 GMNT045-3B — 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 GMNT045-3B — B1370145

Name: OEM Goodman 300°F Rollout Limit Switch for GMNT045-3B — B1370145
Brand: Goodman
SKU: GOODMAN-11625
Price: 19.95 USD
Availability: InStock

SKU: GOODMAN-11625 Brand: Goodman

$19.95 $25.95

OEM Guaranteed

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The Goodman B1370145 Rollout Limit Switch is a genuine OEM safety control engineered for GMNT045-3B gas furnaces and other compatible Goodman and Amana models. Mounted near the burner assembly, this manual-reset switch monitors for flame rollout — a dangerous condition where flames escape the combustion chamber — and shuts down the gas valve the instant temperatures exceed its trip point, protecting your equipment and home.

Specifications

Trip temperature: 300°F (manual reset)
Type: Normally closed, opens on temperature rise
Reset: Manual push-button
Mounting: Bracket-mount, burner box
Fits: Goodman/Amana GMNT045-3B and compatible furnaces
OEM Part #: B1370145

OEM vs. Generic

The genuine OEM B1370145 is calibrated to Goodman's exact 300°F trip specification and carries the correct bracket geometry for a bolt-in fit. Generic aftermarket rollout switches often ship with a universal bracket and looser calibration tolerances, which can cause nuisance trips or delayed shutdowns. For a critical safety component, we recommend the OEM part for reliable protection and full furnace-warranty compliance.

Installation

Difficulty: Easy (1/5). Replacement takes about 10–15 minutes with basic hand tools. Shut off power and gas, remove the two spade connectors, unbolt the switch, install the new unit, and reconnect. No special calibration required. If your furnace is locking out on a rollout fault, always inspect the heat exchanger and flue for the underlying cause before replacing the switch.

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 ...

$19.95

Frequently Asked Questions

Does this Limit Switch fit my Goodman GMNT045-3B — B1370145?

Yes. This is the factory-specified OEM limit switch for the Goodman GMNT045-3B — 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 GMNT045-3B — 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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