What are the specs for this Limit Switch?

The correct replacement for Goodman model OEM Goodman 300°F Rollout Limit Switch GMT090-4B — 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 OEM Goodman 300°F Rollout Limit Switch GMT090-4B — 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 GMT090-4B — B1370145

Name: OEM Goodman 300°F Rollout Limit Switch GMT090-4B — B1370145
Brand: Goodman
SKU: GOODMAN-12394
Price: 4.95 USD
Availability: InStock

SKU: GOODMAN-12394 Brand: Goodman

$4.95 $6.95

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Goodman B1370145 Flame Rollout Switch (300°F)

The genuine Goodman B1370145 is a 300°F manual-reset flame rollout limit switch — a critical safety control on your GMT090-4B furnace. Mounted near the burner assembly, it opens the ignition circuit and shuts down the furnace if flames roll out of the burner box due to a blocked heat exchanger, cracked exchanger, or poor venting. If your furnace locks out on a rollout fault, this inexpensive part is often the fix — but always investigate why it tripped before resetting or replacing.

Part number: B1370145
Trip temperature: 300°F
Reset type: Manual reset
Function: Flame rollout / high-limit safety cutout
Fits: Goodman GMT090-4B furnace

OEM vs. Generic

Because this is a life-safety component, the exact OEM trip temperature and terminal configuration matter. Genuine Goodman ensures the switch opens at the engineered 300°F setpoint. Generic switches with a different rating can nuisance-trip or, worse, fail to protect against a genuine rollout condition. Never substitute a lower- or higher-rated part.

Installation Difficulty

Easy — A single-bracket, two-terminal spade connection. Roughly 10–15 minutes. Important: A tripped rollout switch indicates an underlying combustion or venting problem — diagnose the root cause before returning the furnace to service.

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 OEM Goodman 300°F Rollout Limit Switch GMT090-4B — B1370145?

Yes. This is the factory-specified OEM limit switch for the Goodman OEM Goodman 300°F Rollout Limit Switch GMT090-4B — 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 OEM Goodman 300°F Rollout Limit Switch GMT090-4B — 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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