What are the specs for this Limit Switch?

The correct replacement for Goodman model GUN125-5 — 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 GUN125-5 — 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 Limit Switch for GUN125-5 — B1370108

Name: OEM Goodman 300°F Flame Rollout Limit Switch for GUN125-5 — B1370108
Brand: Goodman
SKU: GOODMAN-13164
Price: 4.95 USD
Availability: InStock

SKU: GOODMAN-13164 Brand: Goodman

$4.95 $6.95

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The Goodman B1370108 Flame Rollout Switch is the genuine OEM 300°F manual-reset limit switch for the Goodman GUN125-5 gas furnace. Mounted on the burner assembly, this safety switch trips and cuts power to the gas valve if flame rolls out of the combustion chamber — a condition usually caused by a blocked heat exchanger or restricted flue. It is a critical burn- and CO-protection device.

Specifications

OEM Part Number: B1370108
Compatible Model: Goodman GUN125-5
Trip Temperature: 300°F
Type: Manual-reset flame rollout / thermal limit switch
Contacts: Normally closed, open on overtemp
Equipment: Gas furnace burner assembly

OEM vs. Generic

The genuine Goodman OEM switch trips at the precise 300°F rating specified for this furnace. Because this is a life-safety component protecting against flame rollout and carbon monoxide, matching the exact OEM trip temperature is essential — never substitute a switch with a different rating.

Installation Difficulty

Easy (1/5). Cut power, disconnect the two leads, remove the mounting screws, and install the new switch in the same orientation. Under 10 minutes. Important: if a rollout switch has tripped, always diagnose and correct the underlying cause (blocked heat exchanger or flue) before returning the furnace to service.

Fitment note: confirm the 300°F rating on your existing switch 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 Flame Rollout ...

$4.95

Frequently Asked Questions

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

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