What are the specs for this Door Switch?

The correct replacement for Goodman model GMPN100-4 — 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 GMPN100-4 — 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 Blower Door Safety Switch w/ Wires for GMPN100-4 — B1370820

Name: OEM Goodman Blower Door Safety Switch w/ Wires for GMPN100-4 — B1370820
Brand: Goodman
SKU: GOODMAN-12097
Price: 40.95 USD
Availability: InStock

SKU: GOODMAN-12097 Brand: Goodman

$40.95 $52.95

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The Goodman B1370820 Blower Door Interlock Switch is a genuine OEM safety switch, pre-wired with a factory harness, for the GMPN100-4 gas furnace and compatible Goodman/Amana models. This interlock cuts power to the furnace whenever the blower access panel is removed, preventing operation with the door open. If your furnace won't start until you jump or hold the door switch, this exact-fit assembly restores safe, code-compliant operation.

Specifications

OEM Part Number: B1370820
Type: Blower-compartment door interlock safety switch
Configuration: SPST plunger switch with pre-attached wire leads
Function: Opens control circuit when access panel is removed
Includes: Switch body and factory wire harness
Fits: Goodman GMPN100-4 furnace and cross-compatible models

OEM vs. Generic

Because this part ships with the OEM Goodman wire harness and correct plunger travel, it drops straight into the factory bracket and mates with existing connectors — no splicing or guesswork. Generic door switches often require re-terminating wires and may not align with the panel's actuating tab, causing intermittent no-start faults. The OEM assembly is the reliable choice.

Installation Difficulty

Easy–Moderate (2 of 5) — Disconnect power, note the wiring, unclip the old switch and harness, mount the new switch so the panel depresses the plunger fully, and reconnect. Confirm the furnace shuts off when the door is removed. If wiring is unclear, hire a licensed HVAC technician.

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...

$40.95

Frequently Asked Questions

Does this Door Switch fit my Goodman GMPN100-4 — B1370820?

Yes. This is the factory-specified OEM door switch for the Goodman GMPN100-4 — 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 GMPN100-4 — 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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