What are the specs for this Door Switch?

The correct replacement for Goodman model GMTH070-4B — 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 GMTH070-4B — 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 w/ Wires for GMTH070-4B — B1370820

Name: OEM Goodman Door Switch w/ Wires for GMTH070-4B — B1370820
Brand: Goodman
SKU: GOODMAN-12557
Price: 54.95 USD
Availability: InStock

SKU: GOODMAN-12557 Brand: Goodman

$54.95 $72.95

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Goodman B1370820 Blower Door Switch with Wire Harness

The B1370820 is a genuine OEM blower-door interlock switch, pre-wired with its factory harness, for the Goodman GMTH070-4B gas furnace and compatible Goodman/Amana models. This safety interlock cuts power to the furnace whenever the blower access panel is removed, preventing the unit from firing with the door open. A failed or corroded door switch is a common cause of a completely dead furnace — replacing it restores the full 24V and line-voltage safety loop.

Specifications

Part Number: B1370820
Type: Blower-compartment door interlock switch
Includes: Factory wire harness with connectors
Function: Normally-open, closes when door is installed
Brand: Goodman (Amana compatible)
Equipment: Gas furnace — fits GMTH070-4B

OEM vs. Generic

The OEM Goodman B1370820 arrives with the correct pre-terminated harness and plunger geometry for a true drop-in fit. The generic equivalent provides the same interlock function and wiring at a reduced price — a practical option when exact harness routing isn't critical.

Installation Difficulty

Moderate (2/5). Requires removing the blower panel, unclipping the old switch, and transferring or plugging in the harness — about 20–30 minutes. Disconnect power before starting. Because this is a safety interlock, confirm the plunger actuates fully when the door is closed; a licensed technician is recommended if you're uncertain.

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 w/ Wires...

$54.95

Frequently Asked Questions

Does this Door Switch fit my Goodman GMTH070-4B — B1370820?

Yes. This is the factory-specified OEM door switch for the Goodman GMTH070-4B — 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 GMTH070-4B — 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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