What are the specs for this Door Switch?

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

Name: OEM Goodman Blower Door Safety Switch for GMNT120-5D — B1370820
Brand: Goodman
SKU: GOODMAN-11775
Price: 40.95 USD
Availability: InStock

SKU: GOODMAN-11775 Brand: Goodman

$40.95 $53.95

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Goodman B1370820 Blower Door Safety Switch

The Goodman B1370820 is a genuine OEM blower door safety interlock switch supplied with pre-attached lead wires, engineered as a direct-fit replacement for the GMNT120-5D gas furnace and many compatible Goodman/Amana models. This normally-open switch cuts power to the blower and control circuit whenever the blower access panel is removed, protecting service technicians and satisfying furnace safety-certification requirements.

A failed or stuck door switch is one of the most common reasons a furnace will not start after a filter change or panel removal — if the door isn't seated, the switch keeps the burner and blower de-energized. Replacing it with the correct OEM part restores reliable ignition without nuisance no-heat calls.

Specifications

Type: SPST normally-open door interlock (plunger actuated)
Pre-wired with color-coded factory leads and connectors
Fits Goodman GMNT120-5D and cross-compatible furnace cabinets
Genuine Goodman OEM part number B1370820
Equipment: Gas furnace

OEM vs. Generic

The OEM B1370820 ships with the exact plunger travel, bracket geometry, and factory harness your furnace expects, so it snaps into the original mounting location and plugs straight in. Generic universal door switches are cheaper but frequently require re-drilling brackets, splicing leads, and adjusting plunger depth — and an incorrectly seated switch can leave the blower dead. For a guaranteed fit and full safety compliance, the OEM part is the reliable choice.

Installation Difficulty

Easy (1 of 5). Most homeowners can replace this in 10–15 minutes with a screwdriver. Shut off power at the disconnect, note the wire routing, unclip the leads, unscrew the switch, and reverse the process. If you are unsure about electrical work, contact 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 GMNT120-5D — B1370820?

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