What are the specs for this Switch?

The correct replacement for Goodman model GUN040-2 — 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 GUN040-2 — B1370109.

What symptoms indicate I need a new switch?

Common symptoms that indicate you need a new 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 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 GUN040-2 — B1370109

Name: OEM Goodman Stack Overtemp Limit Switch for GUN040-2 — B1370109
Brand: Goodman
SKU: GOODMAN-13110
Price: 8.95 USD
Availability: InStock

SKU: GOODMAN-13110 Brand: Goodman

$8.95 $11.95

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The Goodman B1370109 Stack Overtemp Limit Switch is a genuine OEM safety control engineered for the GUN040-2 gas furnace. This normally-closed thermal switch monitors heat-exchanger and stack temperatures and opens the circuit if the furnace exceeds its safe operating range, shutting off the burners to prevent overheating, cracked heat exchangers, and nuisance faults. If your furnace is short-cycling on limit, locking out, or throwing an open-limit code, a failed stack switch is a common culprit.

Specifications

OEM Part Number: B1370109
Type: Stack / overtemp limit switch (normally closed)
Function: High-temperature safety cutout
Compatibility: Goodman GUN040-2 gas furnace
Brand: Goodman (genuine OEM)

OEM vs. Generic

This is the factory-original Goodman part, calibrated to the exact trip and reset temperatures your furnace's control sequence expects. Generic aftermarket limit switches often use approximate temperature ratings that can trip early (nuisance shutdowns) or late (a real safety risk). For a control this critical, OEM is the safe choice.

Installation Difficulty

Easy–Moderate. A DIY-friendly swap for anyone comfortable working inside a furnace cabinet. Cut power at the breaker, disconnect the two terminals, remove the mounting screws, and install the replacement in the same orientation. Most installs take 15–20 minutes. If you are unsure why the original tripped, have the furnace inspected — repeated overtemp faults can indicate airflow restriction or a heat-exchanger problem.

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...

$8.95

Frequently Asked Questions

Does this Switch fit my Goodman GUN040-2 — B1370109?

Yes. This is the factory-specified OEM switch for the Goodman GUN040-2 — 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 switch on my Goodman GUN040-2 — 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 switch?

Common symptoms: unusual noises, intermittent operation, complete failure, or visible damage. Visit our diagnostic hub for symptom-based troubleshooting.

Is this 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 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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