What are the specs for this Door Switch?

The correct replacement for Goodman model GSMS100-4 — B1370819 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 GSMS100-4 — B1370819.

What symptoms indicate I need a new door switch?

Common symptoms that indicate you need a new door 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 door 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 Blower Door Safety Switch for GSMS100-4 — B1370819

Name: OEM Goodman Blower Door Safety Switch for GSMS100-4 — B1370819
Brand: Goodman
SKU: GOODMAN-12981
Price: 22.95 USD
Availability: InStock

SKU: GOODMAN-12981 Brand: Goodman

$22.95 $29.95

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Goodman B1370819 Blower Door Safety Switch

The genuine OEM Goodman B1370819 is a blower-compartment door interlock switch for the Goodman GSMS100-4 furnace and compatible Goodman/Amana units. This normally-open safety switch de-energizes the furnace whenever the blower access panel is removed, preventing operation with the door open. It is a code-required safety component that protects service technicians and homeowners from live electrical and moving-blower hazards.

Specifications

Type: Plunger-actuated door interlock switch
Function: Cuts control/line power when blower door is removed
Fits: Goodman GSMS100-4 and compatible furnaces
OEM Part Number: B1370819
Brand: Goodman (genuine OEM)
Application: Gas furnace blower-door safety

OEM vs. Generic

The genuine Goodman B1370819 matches the exact plunger travel, bracket, and terminal layout of the original, ensuring the door reliably actuates the switch. Generic replacements often have different actuation depths or mounting tabs, which can leave the furnace unable to start or unsafely running with the panel off. OEM is strongly recommended for interlock reliability.

Installation Difficulty

Easy (1/5). With power disconnected, unclip the wire terminals, remove the mounting screw, and install the replacement in the same orientation. Verify the blower door depresses the plunger fully on reassembly. Roughly 15 minutes with basic tools.

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 Blower Door Safety S...

$22.95

Frequently Asked Questions

Does this Door Switch fit my Goodman GSMS100-4 — B1370819?

Yes. This is the factory-specified OEM door switch for the Goodman GSMS100-4 — B1370819. 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 door switch on my Goodman GSMS100-4 — B1370819?

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 door switch?

Common symptoms: unusual noises, intermittent operation, complete failure, or visible damage. Visit our diagnostic hub for symptom-based troubleshooting.

Is this door 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 door 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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