What are the specs for this Limit Switch?

The correct replacement for Goodman model GMNT045-3B — 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 GMNT045-3B — 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 200°F Primary Limit Switch for GMNT045-3B — B1370189

Name: OEM Goodman 200°F Primary Limit Switch for GMNT045-3B — B1370189
Brand: Goodman
SKU: GOODMAN-11627
Price: 21.95 USD
Availability: InStock

SKU: GOODMAN-11627 Brand: Goodman

$21.95 $28.95

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The genuine OEM Goodman B1370189 Primary Limit Switch is the main high-limit safety control for GMNT045-3B and compatible Goodman and Amana gas furnaces. Positioned on the heat-exchanger side of the burner box, it continuously monitors supply-air temperature and interrupts the gas valve if the furnace overheats — preventing heat-exchanger damage and cracked components caused by insufficient airflow.

Specifications

Trip temperature: 200°F (auto-reset)
Type: Normally closed, opens on temperature rise
Reset: Automatic
Mounting: Heat-exchanger / vestibule panel
Fits: Goodman/Amana GMNT045-3B and compatible furnaces
OEM Part #: B1370189

OEM vs. Generic

Because the primary limit governs the furnace's core overheat protection, matching the exact 200°F trip point is essential. OEM B1370189 is factory-calibrated and drops into the original bracket. Generic replacements with adjustable or approximate ratings can trip early (short-cycling) or too late (risking the heat exchanger). We strongly recommend OEM for this component.

Installation

Difficulty: Easy (1/5). About 15 minutes. Cut power, disconnect the two wire terminals, remove the mounting screws, install the new limit in the same orientation, and reconnect. Run a full heat cycle to verify the furnace reaches temperature and shuts down normally. If the primary limit keeps tripping, inspect airflow — dirty filters, closed registers, or a weak blower are the usual culprits.

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 200°F Primary Limit ...

$21.95

Frequently Asked Questions

Does this Limit Switch fit my Goodman GMNT045-3B — B1370189?

Yes. This is the factory-specified OEM limit switch for the Goodman GMNT045-3B — 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 GMNT045-3B — 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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