What are the specs for this Piston Kit?

The correct replacement for Goodman model GMP150-5 Furnace — B1789890 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 GMP150-5 Furnace — B1789890.

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 GMP150-5 Furnace — B1789890

Name: OEM Goodman Piston Kit for GMP150-5 Furnace — B1789890
Brand: Goodman
SKU: GOODMAN-11931
Price: 16.95 USD
Availability: InStock

SKU: GOODMAN-11931 Brand: Goodman

$16.95 $22.95

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Texas CMBL #19328542014

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The Goodman B1789890 Piston Kit is a genuine OEM metering piston assembly designed for the Goodman GMP150-5 furnace. The piston (metering device) controls precise flow through the system, and an incorrectly sized or worn piston leads to poor performance, inefficient operation, and inconsistent output. Installing the factory-specified piston restores the exact metering rate the unit was engineered for.

Specifications

OEM Part Number: B1789890
Component: Metering piston / orifice kit
Compatible Model: Goodman GMP150-5
Flow-rated to factory specification
Brand: Goodman (OEM)

OEM vs. Generic

The OEM Goodman piston is bored to Goodman's exact flow rating for the GMP150-5. Generic pistons are sold in nominal sizes that may not match your unit's specification, causing metering error. Because a piston directly governs flow and efficiency, we strongly recommend the OEM part for correct, safe operation.

Installation Difficulty: Moderate

This repair involves the sealed metering circuit. Cut power, access the metering fitting, replace the piston, and reseal per Goodman's service instructions. Correct torque and leak-checking are essential. If you are not experienced with this type of service, we recommend a licensed HVAC technician install this part.

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

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Frequently Asked Questions

Does this Piston Kit fit my Goodman GMP150-5 Furnace — B1789890?

Yes. This is the factory-specified OEM piston kit for the Goodman GMP150-5 Furnace — B1789890. 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 GMP150-5 Furnace — B1789890?

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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