What are the specs for this Door Switch?

The correct replacement for Goodman model GMNT120-5 — 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 GMNT120-5 — 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 GMNT120-5 — B1370820

Name: OEM Goodman Blower Door Safety Switch w/ Wires for GMNT120-5 — B1370820
Brand: Goodman
SKU: GOODMAN-11753
Price: 40.95 USD
Availability: InStock

SKU: GOODMAN-11753 Brand: Goodman

$40.95 $53.95

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Goodman B1370820 Blower Door Safety Switch (with Wires)

The genuine Goodman B1370820 is a blower-door interlock safety switch, pre-assembled with its wire harness, for the GMNT120-5 furnace and compatible Goodman/Amana models. This switch de-energizes the furnace whenever the blower access panel is removed, preventing operation with the door off — a critical safety and code requirement. Ordering the OEM assembly means the plunger position, harness length, and connector all match the original.

Specifications

Type: Normally-open plunger interlock switch
Includes: Factory wire harness / leads
Function: Blower-door safety cutoff (de-energizes on panel removal)
Mounting: Panel/bracket mount with plunger actuator
Fits: Goodman GMNT120-5 and compatible furnaces
OEM Part #: B1370820

OEM vs. Generic

The OEM B1370820 arrives with the correct wire harness and connector already attached, so there's no splicing or guesswork. Generic door switches often require you to reuse old leads or crimp new ones, introducing failure points. For a safety interlock, the factory pre-wired assembly is the cleaner, more reliable install.

Installation Difficulty

Moderate (2/5). Disconnect power, remove the blower panel, unplug the harness from the control board, unscrew the old switch, mount the new one so the plunger aligns with the door, and reconnect. Verify actuation before returning the furnace 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 Blower Door Safety S...

$40.95

Frequently Asked Questions

Does this Door Switch fit my Goodman GMNT120-5 — B1370820?

Yes. This is the factory-specified OEM door switch for the Goodman GMNT120-5 — 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 GMNT120-5 — 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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