What are the specs for this Limit Switch?

The correct replacement for Goodman model GMTH070-4B — B1370145 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 GMTH070-4B — B1370145.

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 Manual Reset Rollout Limit Switch 300F for GMTH070-4B — B1370145

Name: OEM Goodman Manual Reset Rollout Limit Switch 300F for GMTH070-4B — B1370145
Brand: Goodman
SKU: GOODMAN-12554
Price: 9.95 USD
Availability: InStock

SKU: GOODMAN-12554 Brand: Goodman

$9.95 $13.25

OEM Guaranteed

Same-Day Ship

30-Day Returns

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Texas CMBL #19328542014

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The genuine Goodman B1370145 Flame Rollout Switch is the OEM 300°F manual-reset safety limit that protects your Goodman GMTH070-4B gas furnace from dangerous flame rollout. If flames escape the heat-exchanger burner box — often due to a blocked flue, cracked heat exchanger, or restricted venting — this switch trips and shuts off the gas valve, preventing overheating and fire hazards.

Specifications

OEM Part Number: B1370145
Type: Flame rollout limit switch
Trip Temperature: 300°F
Reset: Manual push-button reset
Contacts: Normally closed (opens on overtemp)
Fits: Goodman GMTH070-4B and compatible furnace models
Function: Burner-box overtemperature safety cutout

OEM vs. Generic

Rollout switches are a life-safety component, and the trip temperature and mounting location are model-specific. The genuine Goodman OEM B1370145 guarantees the correct 300°F rating and bracket fit. Because a mismatched switch can either nuisance-trip or fail to protect, we strongly recommend OEM for all safety limits — never bypass or jumper this device.

Installation Difficulty

Easy (1/5). Mounts with one or two screws and two spade terminals. Shut off power and gas first. Estimated time: 10–15 minutes. Important: if the switch tripped, diagnose and correct the root cause (venting, heat exchanger) before returning the furnace to service — call a licensed technician if you are unsure.

Genuine Goodman quality for essential furnace safety.

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 Manual Reset Rollout...

$9.95

Frequently Asked Questions

Does this Limit Switch fit my Goodman GMTH070-4B — B1370145?

Yes. This is the factory-specified OEM limit switch for the Goodman GMTH070-4B — B1370145. 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 GMTH070-4B — B1370145?

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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