What are the specs for this Limit Switch?

The correct replacement for Goodman model GMNT040-3B — B1370188 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 GMNT040-3B — B1370188.

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 170°F Primary Limit Switch for GMNT040-3B — B1370188

Name: OEM Goodman 170°F Primary Limit Switch for GMNT040-3B — B1370188
Brand: Goodman
SKU: GOODMAN-11619
Price: 12.95 USD
Availability: InStock

SKU: GOODMAN-11619 Brand: Goodman

$12.95 $16.95

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Goodman B1370188 170°F Primary Limit Switch

The Goodman B1370188 is an OEM 170°F primary (high) limit switch, a direct-fit safety and control component for the GMNT040-3B gas furnace. The primary limit is mounted on the heat exchanger bulkhead and performs two jobs: it protects the furnace from overheating by cutting the gas valve if supply airflow is lost, and it helps govern blower on/off timing during the heat cycle.

Specifications

Type: Primary high-limit temperature switch
Trip temperature: 170°F (open on rise)
Contact configuration: Normally closed, opens on temperature rise
Fits: Goodman GMNT040-3B furnace
Reset: Automatic (recloses on cooldown)
OEM Part Number: B1370188
Brand: Goodman

OEM vs. Generic

The 170°F trip point on this primary limit is precisely matched to the GMNT040-3B's heat exchanger and blower table. A generic switch with a different setpoint or disc size can cause short-cycling on high limit, poor temperature rise, or inadequate overheat protection. Genuine Goodman OEM guarantees the correct calibration and bracket fit.

Install Difficulty

Easy — DIY-friendly. The limit mounts with two screws to the exchanger panel and uses quick-connect terminals. Always disconnect power first and confirm the disc seats flush against the panel. If the limit is opening, verify filter, airflow, and blower operation before replacing.

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 170°F Primary Limit ...

$12.95

Frequently Asked Questions

Does this Limit Switch fit my Goodman GMNT040-3B — B1370188?

Yes. This is the factory-specified OEM limit switch for the Goodman GMNT040-3B — B1370188. 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 GMNT040-3B — B1370188?

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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