What are the specs for this Limit Switch?

The correct replacement for Goodman model GMT070-3B — 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 GMT070-3B — 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 GMT070-3B — B1370145

Name: OEM Goodman 300°F Rollout Limit Switch for GMT070-3B — B1370145
Brand: Goodman
SKU: GOODMAN-12311
Price: 4.95 USD
Availability: InStock

SKU: GOODMAN-12311 Brand: Goodman

$4.95 $6.49

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Goodman B1370145 Flame Rollout Limit Switch — 300°F

The B1370145 is a genuine Goodman 300°F manual-reset rollout limit switch for the GMT070-3B gas furnace and compatible Goodman/Amana models. Mounted on the burner assembly, it senses flame rollout caused by a blocked heat exchanger or restricted flue and shuts down the furnace to prevent unsafe combustion. This is a critical safety control — a tripped or failed rollout switch should always be diagnosed for root cause, not just replaced.

Specifications

Trip temperature: 300°F
Type: Flame rollout safety limit, manual reset
Configuration: Normally closed, opens on overtemp
Fits: Goodman GMT070-3B and compatible furnaces
OEM Part Number: B1370145
Equipment: Gas furnace

OEM vs. Generic

The OEM B1370145 is calibrated to trip at exactly 300°F with the correct bracket geometry for burner-box mounting. Generic switches with approximate trip points can either nuisance-trip or fail to protect against true rollout conditions. For a combustion-safety device, use OEM.

Install Difficulty

Easy (1/5) — Cut power, disconnect the two spade terminals, unscrew the switch from the burner bracket, and reverse. Under 10 minutes. Reset the switch and confirm continuity before firing the furnace.

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 GMT070-3B — B1370145?

Yes. This is the factory-specified OEM limit switch for the Goodman GMT070-3B — 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 GMT070-3B — 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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