What are the specs for this Piston Kit?

The correct replacement for Goodman model GMP100-5 Furnace — B1789876 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 GMP100-5 Furnace — B1789876.

What symptoms indicate I need a new piston kit?

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

Is this piston kit 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 Piston Kit for GMP100-5 Furnace — B1789876

Name: OEM Goodman Piston Kit for GMP100-5 Furnace — B1789876
Brand: Goodman
SKU: GOODMAN-11895
Price: 16.95 USD
Availability: InStock

SKU: GOODMAN-11895 Brand: Goodman

$16.95 $22.95

OEM Guaranteed

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30-Day Returns

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Texas CMBL #19328542014

SAM.gov Registered

Govt POs Accepted

The Goodman B1789876 Piston Kit is a genuine OEM metering component engineered for the Goodman GMP100-5 furnace. This kit delivers the precise, calibrated orifice sizing required to maintain correct fuel/refrigerant flow, ensuring stable operation and rated efficiency. Installing a factory-matched piston kit protects your equipment from the flow imbalances and premature wear that off-spec substitutes can cause.

Specifications

Part Number: B1789876
Part Type: Piston / metering device kit
Brand: Goodman (OEM)
Compatible Model: GMP100-5
Equipment Type: Gas Furnace
Fit: Direct replacement — no modification required

OEM vs. Generic

Our OEM option is the exact Goodman-manufactured part, guaranteeing bore tolerance and material spec straight from the factory. Our Generic equivalent is a lower-cost aftermarket alternative built to matching dimensions — a smart pick for budget repairs where an exact OEM stamp isn't required. Both are tested for correct fit on the GMP100-5.

Installation Difficulty

Rating: Moderate (2/3). Replacement involves accessing the metering assembly and correctly seating the piston. We strongly recommend a qualified HVAC technician perform this service, as improper installation can affect furnace performance and safety. Always disconnect power and gas before servicing.

Ships fast from stock. Backed by our fit guarantee for the GMP100-5 platform.

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 Piston Kit for GMP10...

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Frequently Asked Questions

Does this Piston Kit fit my Goodman GMP100-5 Furnace — B1789876?

Yes. This is the factory-specified OEM piston kit for the Goodman GMP100-5 Furnace — B1789876. 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 piston kit on my Goodman GMP100-5 Furnace — B1789876?

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 piston kit?

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

Is this piston kit 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 piston kit?

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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