What are the specs for this Limit Switch?

The correct replacement for Goodman model GMTH045-3B — B1370155 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 GMTH045-3B — B1370155.

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 120°F Auxiliary Limit Switch for GMTH045-3B — B1370155

Name: OEM Goodman 120°F Auxiliary Limit Switch for GMTH045-3B — B1370155
Brand: Goodman
SKU: GOODMAN-12530
Price: 11.96 USD
Availability: InStock

SKU: GOODMAN-12530 Brand: Goodman

$11.96 $15.95

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The Goodman B1370155 Auxiliary Limit Switch is a genuine OEM safety control engineered for the GMTH045-3B gas furnace and compatible Goodman/Amana models. This normally-closed thermal switch opens at approximately 120°F to interrupt the ignition sequence if it detects an overheat or airflow-restriction condition, protecting the heat exchanger and blower housing from damage. It is a primary safety component — a failed or nuisance-tripping limit switch is one of the most common causes of a furnace that lights briefly then shuts down.

Specifications

Part Number: B1370155
Type: Auxiliary / rollout limit switch (manual or auto reset per position)
Open Temperature: 120°F
Function: Normally-closed high-temperature cutout
Fits: Goodman GMTH045-3B and related furnaces
Brand: Goodman (OEM)

OEM vs. Generic

This is the factory-specified Goodman part with the exact trip temperature and terminal configuration your furnace's control logic expects. Generic universal limit switches often use a different cut-out point or bracket, which can cause premature tripping or fail to protect at the correct threshold. For a safety-critical control, we recommend the OEM part.

Installation Difficulty

Easy (2/5). Two spade terminals and one or two mounting screws. Always cut power at the disconnect before servicing. If you are unsure why the original switch failed, have a qualified HVAC technician confirm there is no underlying overheat condition.

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 120°F Auxiliary Limi...

$11.96

Frequently Asked Questions

Does this Limit Switch fit my Goodman GMTH045-3B — B1370155?

Yes. This is the factory-specified OEM limit switch for the Goodman GMTH045-3B — B1370155. 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 GMTH045-3B — B1370155?

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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