What are the specs for this Piston Kit?

The correct replacement for Goodman model ASH130301A — 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 ASH130301A — B1789865.

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 Refrigerant Piston / Orifice Kit for ASH130301A — B1789865

Name: OEM Goodman Refrigerant Piston / Orifice Kit for ASH130301A — B1789865
Brand: Goodman
SKU: GOODMAN-B1789865
Price: 6.95 USD
Availability: InStock

SKU: GOODMAN-B1789865 Brand: Goodman

$6.95 $8.95

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Goodman B1789865 Refrigerant Piston / Orifice Kit

The Goodman B1789865 is a genuine OEM refrigerant metering piston (flowrator/orifice) kit for the ASH130301A heat pump. This small but critical component meters the exact flow of refrigerant into the coil, setting the system's superheat and subcooling. The correct orifice bore size is essential to proper capacity, efficiency, and compressor protection.

Pistons are routinely replaced during coil changes, refrigerant conversions, or when a system shows poor cooling/heating performance traced to an incorrect or clogged orifice. Using the factory-specified bore keeps the ASH130301A operating at its rated SEER and capacity.

Specifications

OEM Part Number: B1789865
Type: Fixed-bore refrigerant metering piston (flowrator)
Fits Model: ASH130301A heat pump
Function: Refrigerant flow metering / expansion device
Brand: Goodman / Amana
Condition: New, genuine OEM

OEM vs. Generic

The genuine B1789865 is bored to the precise orifice size Goodman engineered for this unit's tonnage and refrigerant. A generic piston with the wrong bore will over- or under-feed the coil, causing flooding, starving, high head pressure, or lost capacity. The OEM piston guarantees the correct metering for the ASH130301A.

Installation Difficulty

Professional / Advanced — Replacing the piston requires recovering the refrigerant, opening the liquid line at the metering fitting, seating the new piston with the correct orientation, then evacuating and recharging. This is EPA-regulated refrigerant work best left to a licensed HVAC technician.

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 Refrigerant Piston /...

$6.95

Frequently Asked Questions

Does this Piston Kit fit my Goodman ASH130301A — B1789865?

Yes. This is the factory-specified OEM piston kit for the Goodman ASH130301A — 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 kit on my Goodman ASH130301A — 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 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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