What are the specs for this Limit Switch?

The correct replacement for Goodman model GMT045-3B — 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 GMT045-3B — 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 GMT045-3B — B1370145

Name: OEM Goodman 300°F Rollout Limit Switch for GMT045-3B — B1370145
Brand: Goodman
SKU: GOODMAN-12279
Price: 4.95 USD
Availability: InStock

SKU: GOODMAN-12279 Brand: Goodman

$4.95 $6.95

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Goodman B1370145 300°F Flame Rollout Limit Switch

The Goodman B1370145 is a genuine OEM 300°F flame rollout limit switch designed as an exact-fit replacement for the Goodman GMT045-3B gas furnace. This manual-reset safety control shuts off the gas valve if flames roll out of the burner box — a critical protection against overheating caused by a blocked heat exchanger, poor combustion airflow, or a cracked exchanger. If your furnace locks out on a rollout fault or the switch will not reset, this is the part to replace.

Specifications

Part Number: B1370145 (OEM Goodman)
Trip Temperature: 300°F
Type: Flame rollout safety limit switch
Reset: Manual push-button reset
Fits Model: GMT045-3B furnace
Brand: Goodman / Amana

OEM vs. Generic

The OEM B1370145 is calibrated to the exact 300°F trip point and terminal layout specified for this furnace, so the safety circuit behaves as the factory intended. Because this is a safety device, OEM is strongly recommended — a mismatched generic trip temperature can nuisance-trip or, worse, fail to protect. Only substitute a generic switch with an identical 300°F rating and terminal style.

Installation Difficulty: Easy

Remove two mounting screws, transfer the spade wire terminals, and mount the new switch. Plan 10–15 minutes. Always shut off gas and power before servicing. Important: a tripped rollout switch signals an underlying combustion or heat-exchanger problem — have the root cause inspected before returning the furnace to service.

Compatible with Goodman GMT045-3B. Confirm your part number 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 300°F Rollout Limit ...

$4.95

Frequently Asked Questions

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

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