What are the specs for this Limit Switch?

The correct replacement for Goodman model GUN100-4 — 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 GUN100-4 — 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 GUN100-4 — B1370108

Name: OEM Goodman 300°F Flame Rollout Switch for GUN100-4 — B1370108
Brand: Goodman
SKU: GOODMAN-13148
Price: 4.95 USD
Availability: InStock

SKU: GOODMAN-13148 Brand: Goodman

$4.95 $6.95

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The Goodman B1370108 Flame Rollout Switch is the OEM burner-safety limit that shuts off the gas valve in the GUN100-4 furnace if flames roll out of the burner box. Rated to open at 300°F, it mounts on the burner assembly and detects the excess heat that occurs when a blocked heat exchanger or restricted flue forces combustion flame backward toward the cabinet — a serious fire and carbon-monoxide hazard.

Specifications

OEM Part Number: B1370108
Part Type: Flame Rollout / Manual-Reset Limit Switch
Trip Temperature: 300°F open
Reset: Manual reset button
Fits Model: Goodman GUN100-4 gas furnace
Brand: Goodman / Amana

OEM vs. Generic

A rollout switch is a life-safety device, and its trip point must be exact. The genuine Goodman B1370108 opens precisely at 300°F. Substituting a switch with a different rating defeats the safety design. Important: if this switch has tripped, find and correct the root cause (dirty burners, cracked heat exchanger, blocked flue) before resetting — never just replace and reset.

Installation Difficulty

Easy (1.5 / 5). A single-screw mount and two spade terminals. Physically simple, but the underlying fault must be diagnosed by a qualified technician. Power and gas off before servicing.

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 GUN100-4 — B1370108?

Yes. This is the factory-specified OEM limit switch for the Goodman GUN100-4 — 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 GUN100-4 — 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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