What are the specs for this Door Switch?

The correct replacement for Goodman model GMTH090-5B — 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 GMTH090-5B — 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 with Wires for GMTH090-5B — B1370820

Name: OEM Goodman Door Switch with Wires for GMTH090-5B — B1370820
Brand: Goodman
SKU: GOODMAN-12585
Price: 40.95 USD
Availability: InStock

SKU: GOODMAN-12585 Brand: Goodman

$40.95 $53.95

OEM Guaranteed

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30-Day Returns

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Texas CMBL #19328542014

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The Goodman B1370820 Door Switch with Wires is a genuine OEM blower-compartment safety interlock designed for the GMTH090-5B gas furnace. This switch cuts power to the blower and control circuit whenever the blower access panel is removed, protecting technicians and homeowners during service. When a furnace won't start with the door on but runs with it pushed in by hand, a failed door switch is the most common cause.

Specifications

Type: Blower-door safety interlock switch
Includes: Pre-terminated wire leads for plug-and-play install
Compatibility: Goodman GMTH090-5B and compatible furnace platforms
Function: Normally-open plunger switch, closes when door is seated
Brand: Genuine Goodman OEM

OEM vs. Generic

The genuine Goodman B1370820 arrives with the correct plunger travel, wire gauge, and factory connector so it seats exactly against the blower panel and closes reliably. Generic universal door switches often require splicing, lack the correct actuation distance, and can cause intermittent no-heat faults. For a safety-critical interlock, we recommend the OEM part.

Installation Difficulty

Easy (1 of 5). Disconnect power, remove the two mounting screws, unplug the leads, and reverse. Typical replacement takes 10–15 minutes with a nut driver. Always confirm 24V control power is restored and the blower runs only when the door is seated.

Backed by genuine Goodman quality and an exact-fit guarantee for the GMTH090-5B.

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 with Wir...

$40.95

Frequently Asked Questions

Does this Door Switch fit my Goodman GMTH090-5B — B1370820?

Yes. This is the factory-specified OEM door switch for the Goodman GMTH090-5B — 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 door switch on my Goodman GMTH090-5B — 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 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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