What are the specs for this Limit Switch?

The correct replacement for Goodman model GUN125-5B — B1370108 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 GUN125-5B — B1370108.

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 Flame Rollout Switch for GUN125-5B — B1370108

Name: OEM Goodman 300°F Flame Rollout Switch for GUN125-5B — B1370108
Brand: Goodman
SKU: GOODMAN-13176
Price: 14.95 USD
Availability: InStock

SKU: GOODMAN-13176 Brand: Goodman

$14.95 $19.95

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Goodman B1370108 Flame Rollout Switch (300°F)

The Goodman B1370108 is a genuine OEM flame rollout safety limit switch designed for the GUN125-5B gas furnace and compatible Goodman/Amana equipment. Mounted near the burner assembly, this manual-reset switch opens at 300°F to shut off the gas valve if flames roll out of the combustion chamber — a critical protection against blocked heat exchangers, poor venting, or a cracked heat exchanger.

Specifications

Trip temperature: 300°F
Type: Manual-reset thermal limit switch (normally closed)
Function: Flame rollout / burner safety shutoff
Fitment: Goodman GUN125-5B and compatible furnaces
OEM Part Number: B1370108

OEM vs. Generic

The OEM Goodman B1370108 is manufactured to the precise 300°F rating and bracket geometry your furnace was certified with. Generic rollout switches with a different trip temperature or mounting footprint can compromise safety certification and may not seat correctly. For a life-safety component, genuine OEM is strongly recommended.

Installation Difficulty

Easy (1/5). A quick two-wire, single-fastener replacement. Important: a tripped rollout switch indicates an underlying combustion problem — inspect the heat exchanger and venting before returning the furnace to service. Shut off gas and power first.

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 Flame Rollout ...

$14.95

Frequently Asked Questions

Does this Limit Switch fit my Goodman GUN125-5B — B1370108?

Yes. This is the factory-specified OEM limit switch for the Goodman GUN125-5B — B1370108. 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 GUN125-5B — B1370108?

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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