What are the specs for this Door Switch?

The correct replacement for Goodman model GMTH090-5A — 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 GMTH090-5A — 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.

IMAGE COMING SOON

Goodman

OEM Goodman Blower Door Switch w/ Wires for GMTH090-5A — B1370820

Name: OEM Goodman Blower Door Switch w/ Wires for GMTH090-5A — B1370820
Brand: Goodman
SKU: GOODMAN-B1370820
Price: 40.95 USD
Availability: InStock

SKU: GOODMAN-B1370820 Brand: Goodman

$40.95 $53.95

OEM Guaranteed

Same-Day Ship

30-Day Returns

Secure Checkout

Texas CMBL #19328542014

SAM.gov Registered

Govt POs Accepted

Goodman B1370820 Blower Door Switch with Wires

The Goodman B1370820 door switch is a genuine OEM blower-compartment interlock, supplied complete with its factory wire harness, for the GMTH090-5A gas furnace. This safety switch de-energizes the furnace when the blower access panel is removed, preventing the unit from running with the door off. A furnace that won't start, has no blower operation, or only runs when the panel is pressed by hand almost always points to a failed or misaligned door switch.

Specifications

Part number: B1370820 (OEM Goodman)
Type: Blower door interlock / safety switch
Includes: Pre-wired lead harness
Function: Opens circuit when access panel is removed
Fits: Goodman GMTH090-5A gas furnace
Equipment: Gas furnace

OEM vs. Generic

Because the OEM B1370820 ships with the correct connector and pre-terminated leads, it plugs directly into the Goodman harness — no splicing or crimping guesswork. Generic door switches often require cutting the old harness and matching plunger height, which can leave the interlock unreliable. For a safety interlock, OEM is the recommended choice.

Installation Difficulty: Easy

Rated Easy — one mounting screw and a plug-in connector. Power down at the disconnect first. Verify the plunger aligns with the panel tab so the switch fully closes when the door is reinstalled.

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 Switch w...

$40.95

Frequently Asked Questions

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

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

Menu