What are the specs for this Piston Kit?

The correct replacement for Goodman model WGHP4324AAA — B1789857 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 WGHP4324AAA — B1789857.

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 WGHP4324AAA — B1789857

Name: OEM Goodman Piston Kit for WGHP4324AAA — B1789857
Brand: Goodman
SKU: GOODMAN-887
Price: 10.95 USD
Availability: InStock

SKU: GOODMAN-887 Brand: Goodman

$10.95 $14.78

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Texas CMBL #19328542014

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Govt POs Accepted

The Goodman B1789857 Piston Kit is a genuine OEM refrigerant metering device for the WGHP4324AAA packaged heat pump. The piston (also called a flowrator or orifice) controls the precise flow of refrigerant into the evaporator coil, maintaining proper superheat and rated cooling/heating capacity.

Specifications

OEM Part Number: B1789857
Brand: Goodman
Fits Model: WGHP4324AAA
Type: Fixed-orifice piston / flowrator kit
Function: Refrigerant metering to evaporator
Material: Machined brass orifice with retainer

OEM vs. Generic

Piston bore size is matched to the tonnage and refrigerant of the WGHP4324AAA. Installing a genuine Goodman OEM piston ensures the exact orifice diameter the system was engineered for. A generic piston with the wrong bore will flood or starve the coil, hurting efficiency and risking compressor damage.

Installation Difficulty

Hard / Professional. Requires refrigerant recovery, opening the liquid line, seating the new piston in its housing, evacuation, and recharge. EPA certification recommended; best left to an 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 Piston Kit for WGHP4...

$10.95

Frequently Asked Questions

Does this Piston Kit fit my Goodman WGHP4324AAA — B1789857?

Yes. This is the factory-specified OEM piston kit for the Goodman WGHP4324AAA — B1789857. 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 WGHP4324AAA — B1789857?

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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