What are the specs for this Limit Switch?

The correct replacement for Goodman model GMT045-3 Furnace — 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 GMT045-3 Furnace — 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 300F Rollout Limit Switch for GMT045-3 Furnace — B1370145

Name: OEM Goodman 300F Rollout Limit Switch for GMT045-3 Furnace — B1370145
Brand: Goodman
SKU: GOODMAN-12266
Price: 4.95 USD
Availability: InStock

SKU: GOODMAN-12266 Brand: Goodman

$4.95 $6.95

OEM Guaranteed

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Goodman B1370145 Flame Rollout Switch — 300°F

This genuine OEM B1370145 rollout limit switch is a primary safety control on your Goodman GMT045-3 furnace. It monitors for flame rollout at the burner box and cuts power to the gas valve if temperatures reach 300°F, preventing dangerous overheating. If your furnace locks out on a rollout fault or the switch fails to reset, replacing it restores safe operation.

Specifications

Trip temperature: 300°F
Reset type: manual push-button reset
OEM part number: B1370145
Fits Goodman GMT045-3 series furnaces
Normally-closed, opens on temperature rise

OEM vs. Generic

Because this is a life-safety component, we strongly recommend the OEM switch — it is calibrated to Goodman's exact 300°F trip point and terminal spacing. A Generic switch may carry the same rating at lower cost but can vary in trip tolerance. For gas-safety parts, exact calibration matters.

Installation Difficulty

Easy. Two mounting screws and two push-on spade terminals. Budget 15–20 minutes. Shut off gas and power first, and never bypass a tripped rollout switch — repeated trips indicate a heat-exchanger or venting problem that needs inspection.

Compatible with GMT045-3 furnaces. Confirm your model plate before ordering.

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 300F Rollout Limit S...

$4.95

Frequently Asked Questions

Does this Limit Switch fit my Goodman GMT045-3 Furnace — B1370145?

Yes. This is the factory-specified OEM limit switch for the Goodman GMT045-3 Furnace — 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 GMT045-3 Furnace — 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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