What are the specs for this Limit Switch?

The correct replacement for Goodman model GMT045-3B Furnace — B1370189 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 Furnace — B1370189.

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 Primary Limit Switch 200F for GMT045-3B Furnace — B1370189

Name: OEM Goodman Primary Limit Switch 200F for GMT045-3B Furnace — B1370189
Brand: Goodman
SKU: GOODMAN-12281
Price: 9.95 USD
Availability: InStock

SKU: GOODMAN-12281 Brand: Goodman

$9.95 $12.95

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Goodman B1370189 Primary Limit Switch (200°F)

The B1370189 is a genuine Goodman primary high-limit switch engineered as a direct replacement for GMT045-3B gas furnaces and related Goodman/Amana equipment. Mounted on the heat exchanger/plenum, this normally-closed control opens at roughly 200°F to interrupt the burner circuit and stop combustion if supply-air temperature climbs too high — the furnace's primary overheat protection against restricted airflow or a failed blower.

Specifications

Function: Primary high-limit safety switch
Open temperature: 200°F (auto-reset)
Configuration: Normally closed (opens on over-temperature)
Fit: Direct OEM replacement for GMT045-3B
Brand: Goodman genuine OEM part

OEM vs. Generic

The genuine Goodman OEM switch is factory-calibrated to the exact 200°F trip point matched to this furnace's cabinet and airflow design. Generic replacements with a different rating or bracket can cause premature cycling on limit or allow the exchanger to overheat. For a life-safety component, OEM is the right choice.

Installation Difficulty

Easy (1 of 5). Remove two screws, transfer the spade terminals, and mount the new switch in the same orientation. Shut off power and gas first; when in doubt, hire a licensed 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 Primary Limit Switch...

$9.95

Frequently Asked Questions

Does this Limit Switch fit my Goodman GMT045-3B Furnace — B1370189?

Yes. This is the factory-specified OEM limit switch for the Goodman GMT045-3B Furnace — B1370189. 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 Furnace — B1370189?

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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