What are the specs for this Limit Switch?

The correct replacement for Goodman model GMNT120-5B — 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 GMNT120-5B — 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 GMNT120-5B — B1370188

Name: OEM Goodman 170°F Primary Limit Switch for GMNT120-5B — B1370188
Brand: Goodman
SKU: GOODMAN-11758
Price: 12.95 USD
Availability: InStock

SKU: GOODMAN-11758 Brand: Goodman

$12.95 $16.95

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Goodman B1370188 170°F Primary Limit Switch

The Goodman B1370188 is a genuine OEM primary high-limit switch rated at 170°F, engineered as a direct-fit replacement for the GMNT120-5B gas furnace. The primary limit is the furnace's main overheat protector, mounted on the heat-exchanger bulkhead. It monitors supply-air temperature and shuts off the gas valve if the furnace overheats from restricted airflow, protecting the heat exchanger and blower from thermal damage.

Specifications

Trip temperature: 170°F (open on rise)
Type: primary high-limit control
Reset: automatic reset on cool-down
Terminals: 1/4 in. spade connections
Fits: Goodman GMNT120-5B furnace
OEM part number: B1370188

OEM vs. Generic

This genuine OEM Goodman limit is factory-calibrated to the 170°F cutout specified for your model. The primary limit is a safety-critical component; substituting a generic switch with a mismatched trip temperature or sensor length can cause short cycling or leave the heat exchanger unprotected. Always use the OEM-rated part for this position.

Installation Difficulty

Easy to Moderate (2.5/5). Cut power, remove the two spade wires and mounting screws, and install the replacement in the same orientation. If the primary limit keeps tripping, inspect the filter, blower speed, and ductwork for airflow restrictions before replacing.

Fits Goodman GMNT120-5B. Always shut off power at the breaker before servicing.

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 GMNT120-5B — B1370188?

Yes. This is the factory-specified OEM limit switch for the Goodman GMNT120-5B — 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 GMNT120-5B — 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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