What are the specs for this Limit Switch?

The correct replacement for Goodman model GMP125-5 — B1370912S 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 GMP125-5 — B1370912S.

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 240F Primary Limit Switch 7in for GMP125-5 — B1370912S

Name: OEM Goodman 240F Primary Limit Switch 7in for GMP125-5 — B1370912S
Brand: Goodman
SKU: GOODMAN-11924
Price: 24.95 USD
Availability: InStock

SKU: GOODMAN-11924 Brand: Goodman

$24.95 $32.95

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The Goodman B1370912S Primary Limit Switch is a genuine OEM high-limit safety control for the GMP125-5 gas furnace and compatible models. It features a 240°F trip point on a 7-inch insert probe that reaches into the heat exchanger air stream. If supply-air temperature climbs past the setpoint — usually from restricted airflow or blower failure — the switch opens to shut off the gas valve and prevent heat-exchanger damage, then automatically resets once the plenum cools.

Specifications

Part number: B1370912S
Trip temperature: 240°F (open on rise)
Insert / probe length: 7 inches
Type: Auto-reset primary high-limit switch
Contacts: Normally closed
Fits: GMP125-5 and compatible Goodman furnaces

OEM vs. Generic

This OEM limit is matched to the GMP125-5's exact trip temperature and probe length. A generic limit with the wrong setpoint or insert length can nuisance-trip on normal heating cycles or fail to protect the heat exchanger. For a safety limit, use the OEM part.

Install Difficulty

Easy (2/5). Disconnect power, remove the two mounting screws, unplug the spade terminals, and slide the new limit into the same opening with the probe fully inserted. If the old limit was tripping, correct the underlying airflow problem (dirty filter, failed blower, closed registers) before returning to service.

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 240F Primary Limit S...

$24.95

Frequently Asked Questions

Does this Limit Switch fit my Goodman GMP125-5 — B1370912S?

Yes. This is the factory-specified OEM limit switch for the Goodman GMP125-5 — B1370912S. 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 GMP125-5 — B1370912S?

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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