What are the specs for this Furnace Door Switch?

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

What symptoms indicate I need a new furnace door switch?

Common symptoms that indicate you need a new furnace door switch include unusual noises, intermittent operation, complete failure to operate, or visible damage. For specific diagnostic guidance, visit nationalhvacparts.com/pages/hvac-diagnostic.

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Goodman

OEM Goodman Furnace Door Interlock Safety Switch for GMNT120-5B — B1370820

Name: OEM Goodman Furnace Door Interlock Safety Switch for GMNT120-5B — B1370820
Brand: Goodman
SKU: GOODMAN-11760
Price: 40.95 USD
Availability: InStock

SKU: GOODMAN-11760 Brand: Goodman

$40.95 $54.95

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The Goodman B1370820 Door Interlock Safety Switch is a genuine OEM replacement part engineered for the Goodman GMNT120-5B gas furnace and compatible models. This SPST interlock switch cuts power to the blower and control circuit whenever the blower access door is removed, protecting technicians and homeowners from live components and moving parts. It ships with the factory wiring harness attached for a plug-and-play install.

Specifications

Part Number: B1370820
Type: SPST normally-open door interlock switch
Includes: Pre-attached wire leads
Function: Disables blower/control power when door is open
Fits: Goodman GMNT120-5B and select Goodman/Amana furnaces
Brand: Goodman (OEM)

OEM vs. Generic

Choosing this genuine Goodman OEM switch guarantees exact contact ratings, actuator travel, and mounting geometry — critical for a safety device. Aftermarket door switches often have looser tolerances that can cause nuisance blower shutdowns or fail to break the circuit reliably. For a component tied directly to occupant safety, OEM is the recommended choice.

Installation Difficulty

Easy (1/5). Disconnect power at the breaker, remove the blower door, unclip the two spade connectors, and swap the switch into its bracket. Most installs take under 15 minutes. Always confirm the switch opens when the door is removed before restoring power. If you are not comfortable working near line-voltage wiring, 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 Furnace Door Interlo...

$40.95

Frequently Asked Questions

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

Yes. This is the factory-specified OEM furnace door switch for the Goodman GMNT120-5B — 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 furnace door switch on my Goodman GMNT120-5B — 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 furnace door switch?

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

Is this furnace 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 furnace 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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