What are the specs for this Limit Switch?

The correct replacement for Goodman model GMNT120-5D — B1370145 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 GMNT120-5D — B1370145.

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 Rollout Switch for GMNT120-5D — B1370145

Name: OEM Goodman 300°F Rollout Switch for GMNT120-5D — B1370145
Brand: Goodman
SKU: GOODMAN-11772
Price: 4.95 USD
Availability: InStock

SKU: GOODMAN-11772 Brand: Goodman

$4.95 $6.49

OEM Guaranteed

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30-Day Returns

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Texas CMBL #19328542014

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Govt POs Accepted

The Goodman B1370145 Flame Rollout Switch is a genuine OEM 300°F manual-reset safety limit designed for the GMNT120-5D gas furnace. Mounted near the burner box, the rollout switch instantly cuts power to the gas valve if flames roll out of the burner compartment — a sign of a blocked heat exchanger or restricted venting. It is a critical safety device that prevents fire and overheating damage.

Specifications

OEM Part Number: B1370145
Brand: Goodman
Trip Temperature: 300°F
Type: Flame rollout limit, manual reset
Equipment Type: Gas Furnace
Compatible Model: GMNT120-5D

OEM vs. Generic

The OEM B1370145 is calibrated to the exact 300°F trip point and terminal configuration Goodman specifies for this furnace. Generic limit switches may carry a different trip temperature or reset style, causing nuisance lockouts or, worse, failing to trip when needed. For a life-safety component, OEM is strongly recommended.

Installation Difficulty

Easy — DIY-friendly. Remove the furnace door, disconnect the two spade terminals, unscrew the switch, and mount the replacement. Always shut off gas and power first. If the switch keeps tripping after replacement, have the heat exchanger and venting inspected by a professional.

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 Rollout Switch...

$4.95

Frequently Asked Questions

Does this Limit Switch fit my Goodman GMNT120-5D — B1370145?

Yes. This is the factory-specified OEM limit switch for the Goodman GMNT120-5D — B1370145. 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 GMNT120-5D — B1370145?

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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