What are the specs for this Limit Switch?

The correct replacement for Goodman model GMT140-5A — 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 GMT140-5A — 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 GMT140-5A — B1370145

Name: OEM Goodman 300F Rollout Limit Switch for GMT140-5A — B1370145
Brand: Goodman
SKU: GOODMAN-12483
Price: 18.95 USD
Availability: InStock

SKU: GOODMAN-12483 Brand: Goodman

$18.95 $24.95

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Protect your furnace and home with the genuine Goodman B1370145 flame rollout limit switch, rated to trip at 300°F and built for the Goodman GMT140-5A gas furnace and compatible Goodman/Amana models. This manual-reset safety device mounts near the burner box and instantly cuts power to the gas valve if flames roll out of the combustion chamber — a critical protection against a blocked heat exchanger or restricted venting.

Specifications

Trip temperature: 300°F
Type: manual-reset flame rollout safety limit switch
Function: de-energizes gas valve on rollout condition
Fits: Goodman GMT140-5A and compatible Goodman & Amana furnaces
OEM part number: B1370145

OEM vs. Generic

Because this is a safety-critical control, the OEM B1370145 is calibrated and tested to trip at the exact factory setpoint. Generic switches may open early (nuisance lockouts) or late (defeating the protection). For a life-safety component, always choose the genuine Goodman part.

Installation Difficulty

Easy — usually two mounting screws and two push-on spade terminals. Cut power first, note the wire positions, swap the switch, and press its reset button. If the new switch trips again, stop and have the furnace inspected — a tripped rollout switch signals an underlying combustion problem.

Never bypass a safety switch. Disconnect power before servicing and involve a licensed HVAC technician if the condition recurs.

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...

$18.95

Frequently Asked Questions

Does this Limit Switch fit my Goodman GMT140-5A — B1370145?

Yes. This is the factory-specified OEM limit switch for the Goodman GMT140-5A — 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 GMT140-5A — 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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