What are the specs for this Door Switch?

The correct replacement for Goodman model GUN125-5B — B1370819 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 GUN125-5B — B1370819.

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 GUN125-5B — B1370819

Name: OEM Goodman Blower Door Safety Switch for GUN125-5B — B1370819
Brand: Goodman
SKU: GOODMAN-13178
Price: 22.95 USD
Availability: InStock

SKU: GOODMAN-13178 Brand: Goodman

$22.95 $29.95

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Goodman B1370819 Blower Door Safety Switch

The Goodman B1370819 is a genuine OEM blower-compartment door interlock switch for the GUN125-5B gas furnace and compatible Goodman/Amana models. This safety switch cuts 24V (and blower) power whenever the access panel is removed, preventing the furnace from operating with the door open. A failed or stuck door switch is a frequent reason a furnace appears completely dead.

Specifications

Type: Plunger/interlock safety switch (normally open)
Function: De-energizes furnace when blower door is removed
Fitment: Goodman GUN125-5B and compatible furnaces
OEM Part Number: B1370819

OEM vs. Generic

The OEM Goodman B1370819 matches the exact plunger length and bracket location so the panel actuates it correctly. Generic switches with a different throw may fail to close fully, leaving the furnace dead even with the door on. For dependable operation, choose the genuine OEM part.

Installation Difficulty

Easy (1/5). A simple two-wire, single-screw swap inside the blower compartment. Disconnect power at the breaker before servicing and confirm the plunger depresses cleanly when the panel 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 Safety S...

$22.95

Frequently Asked Questions

Does this Door Switch fit my Goodman GUN125-5B — B1370819?

Yes. This is the factory-specified OEM door switch for the Goodman GUN125-5B — B1370819. 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 GUN125-5B — B1370819?

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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