What are the specs for this Door Switch?

The correct replacement for Goodman model GSM100-4 — B1370820 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 GSM100-4 — B1370820.

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 Door Switch with Wires for GSM100-4 — B1370820

Name: OEM Goodman Door Switch with Wires for GSM100-4 — B1370820
Brand: Goodman
SKU: GOODMAN-12944
Price: 40.95 USD
Availability: InStock

SKU: GOODMAN-12944 Brand: Goodman

$40.95 $52.95

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Goodman B1370820 Blower Door Safety Switch (with Wires)

The Goodman B1370820 is a genuine OEM blower-door interlock safety switch, supplied pre-wired with its wire harness, for GSM100-4 series gas furnaces and compatible Goodman/Amana equipment. This normally-open interlock removes power to the furnace whenever the blower access panel is removed, protecting service techs and homeowners from live wiring and a spinning blower wheel. If your furnace is completely dead with no display, a stuck, broken, or misaligned door switch is a common and inexpensive culprit.

Specifications

OEM Part Number: B1370820
Type: Blower-door interlock safety switch
Includes: Pre-attached wire harness
Action: Opens (cuts power) when access panel is removed
Fits Model: GSM100-4 and compatible Goodman/Amana furnaces
Brand: Goodman (OEM)

OEM vs. Generic

The OEM B1370820 comes with the correct connector and lead lengths, so it plugs into the GSM100-4 harness without splicing. Generic door switches usually require cutting and crimping wires and may sit at the wrong actuation depth, leaving the furnace intermittently dead. For a true plug-in replacement, choose OEM.

Installation Difficulty

Easy (2/5) — Unclip the old switch from the blower shelf, unplug the harness, and snap the new one in. No wire splicing needed thanks to the included leads. About 15 minutes with power off.

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 Door Switch with Wir...

$40.95

Frequently Asked Questions

Does this Door Switch fit my Goodman GSM100-4 — B1370820?

Yes. This is the factory-specified OEM door switch for the Goodman GSM100-4 — B1370820. 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 GSM100-4 — B1370820?

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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