What are the specs for this Limit Switch?

The correct replacement for Goodman model GMTH045-3 — 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 GMTH045-3 — 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.

IMAGE COMING SOON

Goodman

OEM Goodman 300°F Rollout Limit Switch for GMTH045-3 — B1370145

Name: OEM Goodman 300°F Rollout Limit Switch for GMTH045-3 — B1370145
Brand: Goodman
SKU: GOODMAN-12514
Price: 4.95 USD
Availability: InStock

SKU: GOODMAN-12514 Brand: Goodman

$4.95 $6.95

OEM Guaranteed

Same-Day Ship

30-Day Returns

Secure Checkout

Texas CMBL #19328542014

SAM.gov Registered

Govt POs Accepted

Goodman B1370145 Flame Rollout Limit Switch (300°F)

The Goodman B1370145 is a genuine OEM 300°F flame rollout limit switch for GMTH045-3 gas furnaces. This manual-reset safety device mounts on the burner assembly and opens the ignition circuit if flames roll out of the burner box — a critical protection against overheating caused by a blocked heat exchanger, failed inducer, or restricted venting. A tripped or failed rollout switch will prevent the furnace from firing until the underlying cause is corrected and the switch is reset or replaced.

Specifications

Trip Temperature: 300°F (opens on rise)
Reset: Manual push-button
OEM Part Number: B1370145
Fits: Goodman GMTH045-3 furnace
Application: Flame rollout safety limit

OEM vs. Generic

Because this is a life-safety component, exact temperature calibration and mounting geometry matter. Genuine OEM guarantees the correct 300°F trip point and bracket fit. Generic switches with an incorrect setpoint can either nuisance-trip or, worse, fail to protect against a real rollout condition. Always use the OEM-spec part here.

Installation Difficulty

Easy (2/5) — Disconnect power, note the wiring, remove the two mounting screws, transfer the terminals to the new switch, and remount. Important: a repeatedly tripping rollout switch signals a serious fault — have a licensed technician diagnose the root cause before returning the furnace to service.

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 Limit ...

$4.95

Frequently Asked Questions

Does this Limit Switch fit my Goodman GMTH045-3 — B1370145?

Yes. This is the factory-specified OEM limit switch for the Goodman GMTH045-3 — 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 GMTH045-3 — 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.

Menu