What are the specs for this Piston?

The correct replacement for Goodman model ASH130301AA Heat Pump — B1789865 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 ASH130301AA Heat Pump — B1789865.

What symptoms indicate I need a new piston?

Common symptoms that indicate you need a new piston 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 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 ASH130301AA Heat Pump — B1789865

Name: OEM Goodman Piston Kit for ASH130301AA Heat Pump — B1789865
Brand: Goodman
SKU: GOODMAN-15985
Price: 6.95 USD
Availability: InStock

SKU: GOODMAN-15985 Brand: Goodman

$6.95 $8.95

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Goodman B1789865 Piston (Flowrator) Kit

The Goodman B1789865 piston kit is a genuine OEM refrigerant metering device engineered for the ASH130301AA 2.5-ton 13 SEER heat pump. The fixed-orifice piston seats inside the liquid line at the coil to meter the exact volume of refrigerant into the evaporator or condenser coil, keeping superheat and subcooling within factory spec. Using the correctly sized piston is critical — an incorrect bore diameter starves or floods the coil, killing capacity and efficiency.

Specifications

OEM Part Number: B1789865
Type: Fixed-orifice flowrator piston kit
Compatible Equipment: Goodman ASH130301AA heat pump
Application: R-410A refrigerant metering
Brand: Goodman (genuine OEM)

OEM vs. Generic

Genuine OEM pistons are bore-calibrated to the tolerance the coil was designed around. Aftermarket universal pistons often vary a few thousandths of an inch, which shifts your charge and shortens compressor life. For a metering component this small, the OEM part is the safe choice.

Install Difficulty

Intermediate — requires recovering refrigerant, opening the liquid line, and re-evacuating/recharging the system. This is EPA Section 608 certified technician work; not a homeowner DIY job.

Ships fast and backed by our fit guarantee. Questions? Contact info@nationalhvacparts.com.

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 ASH13...

$6.95

Frequently Asked Questions

Does this Piston fit my Goodman ASH130301AA Heat Pump — B1789865?

Yes. This is the factory-specified OEM piston for the Goodman ASH130301AA Heat Pump — B1789865. 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 on my Goodman ASH130301AA Heat Pump — B1789865?

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?

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

Is this piston 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?

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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