What are the specs for this Limit Switch?

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

Name: OEM Goodman 120°F Auxiliary Limit Switch for GMTH045-3 — B1370155
Brand: Goodman
SKU: GOODMAN-12515
Price: 14.95 USD
Availability: InStock

SKU: GOODMAN-12515 Brand: Goodman

$14.95 $19.95

OEM Guaranteed

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The Goodman B1370155 Auxiliary Limit Switch is a genuine OEM safety control engineered for the GMTH045-3 gas furnace. This normally-closed thermal limit switch opens at approximately 120°F to protect the blower compartment and secondary heat exchanger area from overheating, shutting down the burners if airflow is restricted or temperatures climb beyond safe limits. Installing the correct factory-spec switch keeps your furnace's high-limit protection working exactly as designed.

Specifications

OEM Part Number: B1370155
Type: Auxiliary / high-limit switch
Open Temperature: 120°F (nominal cut-out)
Contact Configuration: Normally Closed (opens on rise)
Compatible Model: Goodman GMTH045-3 furnace
Brand: Goodman (genuine OEM)

OEM vs. Generic

Choosing the genuine Goodman B1370155 guarantees the exact trip temperature, mounting footprint, and terminal spacing your furnace's control board expects. Generic aftermarket limit switches may carry a different cut-out point or bracket, which can cause nuisance lockouts or, worse, fail to trip when needed. For a safety-critical component, the OEM part is the reliable choice.

Installation Difficulty

Easy — Intermediate DIY (2/5). Replacement typically involves cutting power at the breaker, removing two mounting screws, and transferring the spade connectors. Basic hand tools and a multimeter to confirm continuity are all that's required. If you are unsure about furnace safety wiring, have a licensed HVAC technician perform the swap.

Ships fast and backed by genuine Goodman quality. Keep your GMTH045-3 running safely — order the B1370155 today.

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...

$14.95

Frequently Asked Questions

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

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