What are the specs for this Limit Switch?

The correct replacement for Goodman model GUN125-5 — B1370109 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 — B1370109.

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 Stack Overtemp Limit Switch for GUN125-5 — B1370109

Name: OEM Goodman Stack Overtemp Limit Switch for GUN125-5 — B1370109
Brand: Goodman
SKU: GOODMAN-13165
Price: 19.95 USD
Availability: InStock

SKU: GOODMAN-13165 Brand: Goodman

$19.95 $26.95

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The Goodman B1370109 Stack Overtemp Limit Switch is a factory OEM safety control engineered for the Goodman/Amana GUN125-5 gas furnace. Mounted on the flue collector or heat exchanger stack, this normally-closed switch continuously monitors flue-gas temperature and opens the burner circuit if the furnace exceeds its safe operating limit — protecting the heat exchanger from cracking and preventing dangerous overheating.

Specifications

Part Number: B1370109
Type: Stack / flue overtemperature limit switch (auto-reset)
Function: Normally-closed high-limit safety cutout
Fits: Goodman GUN125-5 gas furnace
Brand: Goodman OEM replacement

OEM vs. Generic

Choosing the genuine OEM B1370109 guarantees the exact trip temperature and mechanical footprint Goodman engineered for the GUN125-5. Aftermarket universal limit switches often use approximate temperature ratings and can nuisance-trip or fail to protect the heat exchanger. For a safety-critical component, OEM is strongly recommended.

Installation Difficulty

Easy (2/5). A single two-wire connection and one mounting screw. Always shut off gas and electrical power before servicing. If you are unsure about safety controls, consult a licensed HVAC technician.

Every part is inspected for correct fit before shipping. Order the Goodman B1370109 today to restore your furnace's high-limit protection.

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 Stack Overtemp Limit...

$19.95

Frequently Asked Questions

Does this Limit Switch fit my Goodman GUN125-5 — B1370109?

Yes. This is the factory-specified OEM limit switch for the Goodman GUN125-5 — B1370109. 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 — B1370109?

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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