What are the specs for this Limit Switch?

The correct replacement for Goodman model GMT045-3B — 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 GMT045-3B — 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 Auxiliary Limit Switch 120F Rollout for GMT045-3B — B1370155

Name: OEM Goodman Auxiliary Limit Switch 120F Rollout for GMT045-3B — B1370155
Brand: Goodman
SKU: GOODMAN-12280
Price: 11.96 USD
Availability: InStock

SKU: GOODMAN-12280 Brand: Goodman

$11.96 $15.95

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Goodman B1370155 Auxiliary Limit Switch (120°F)

The B1370155 is a genuine Goodman auxiliary (rollout) limit switch designed as a direct-fit safety control for GMT045-3B gas furnaces and compatible Goodman/Amana models. This normally-closed thermal switch opens at approximately 120°F to shut down the burner circuit if it detects abnormal heat or flame rollout, protecting your furnace and home from unsafe operating conditions.

Specifications

Function: Auxiliary / flame rollout limit switch
Open temperature: 120°F (auto-reset)
Configuration: Normally closed (opens on temperature rise)
Fit: Direct OEM replacement for GMT045-3B
Brand: Goodman genuine OEM part

OEM vs. Generic

This is a genuine Goodman OEM switch calibrated to the exact trip temperature the furnace control board expects. Generic universal switches may carry a different trip point or reset behavior, which can cause nuisance lockouts or, worse, fail to open when needed. For a critical safety control, OEM is strongly recommended.

Installation Difficulty

Easy (1 of 5). Two mounting screws and a pair of push-on terminals. Always disconnect power and gas before servicing; if you are unsure, consult a licensed HVAC technician.

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 Auxiliary Limit Swit...

$11.96

Frequently Asked Questions

Does this Limit Switch fit my Goodman GMT045-3B — B1370155?

Yes. This is the factory-specified OEM limit switch for the Goodman GMT045-3B — 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 GMT045-3B — 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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