What are the specs for this Wiring Harness?

The correct replacement for Goodman model GMT115-5 Furnace — B1225020 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 GMT115-5 Furnace — B1225020.

What symptoms indicate I need a new wiring harness?

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

Is this wiring harness 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 Wiring Harness for GMT115-5 Furnace — B1225020

Name: OEM Goodman Wiring Harness for GMT115-5 Furnace — B1225020
Brand: Goodman
SKU: GOODMAN-12420
Price: 9.95 USD
Availability: InStock

SKU: GOODMAN-12420 Brand: Goodman

$9.95 $12.95

OEM Guaranteed

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30-Day Returns

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Texas CMBL #19328542014

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The Goodman B1225020 Wiring Harness is a genuine OEM replacement assembly engineered for the Goodman GMT115-5 gas furnace. This factory harness delivers the correct gauge, length, and connector terminations to restore reliable control and blower circuit connections without splicing or rewiring.

A cracked, brittle, or heat-damaged harness is a common cause of intermittent furnace faults, nuisance lockouts, and blower drop-outs. Replacing it with the exact OEM assembly ensures every plug lands where the factory intended.

Specifications

Part Number: B1225020
Type: Wiring Harness / Wire Loom Assembly
Brand: Goodman (Genuine OEM)
Fits Model: GMT115-5 gas furnace
Connectors: Factory keyed plugs, pre-terminated

OEM vs. Generic

Our OEM Goodman harness uses factory-spec connectors that seat cleanly into the control board and blower without adapters. Generic or hand-spliced substitutes often introduce loose terminals and resistance faults that trigger error codes. For a furnace's low-voltage and line-voltage runs, the exact OEM harness is the safe choice.

Installation Difficulty

Easy to Moderate — plug-and-play for a technician; roughly 20–30 minutes. Always disconnect power at the breaker before servicing. If you are not comfortable working around line-voltage furnace wiring, hire a licensed HVAC professional.

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 Wiring Harness for G...

$9.95

Frequently Asked Questions

Does this Wiring Harness fit my Goodman GMT115-5 Furnace — B1225020?

Yes. This is the factory-specified OEM wiring harness for the Goodman GMT115-5 Furnace — B1225020. 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 wiring harness on my Goodman GMT115-5 Furnace — B1225020?

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 wiring harness?

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

Is this wiring harness 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 wiring harness?

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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