What are the specs for this Piston?

The correct replacement for Goodman model WGHP4336AAA Heat Pump — B1789868 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 WGHP4336AAA Heat Pump — B1789868.

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 WGHP4336AAA Heat Pump — B1789868

Name: OEM Goodman Piston Kit for WGHP4336AAA Heat Pump — B1789868
Brand: Goodman
SKU: GOODMAN-895
Price: 10.95 USD
Availability: InStock

SKU: GOODMAN-895 Brand: Goodman

$10.95 $14.78

OEM Guaranteed

Same-Day Ship

30-Day Returns

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Texas CMBL #19328542014

SAM.gov Registered

Govt POs Accepted

The Goodman B1789868 Piston Kit is a genuine OEM refrigerant metering device engineered for WGHP4336AAA heat pump systems. The piston (also called a flowrator or fixed orifice) controls refrigerant flow into the coil, ensuring correct superheat, proper capacity, and efficient operation. A worn, mismatched, or missing piston causes poor cooling, icing, and high energy bills — making this an essential part for any coil or system replacement.

Specifications

OEM Part Number: B1789868
Compatible Model: WGHP4336AAA
Type: Fixed-orifice piston / flowrator metering device
Brand: Goodman
Application: Heat pump refrigerant control
Fit: Direct OEM exact-fit replacement

OEM vs. Generic

Our OEM B1789868 is bored to the precise factory orifice diameter for the WGHP4336AAA, guaranteeing rated capacity and efficiency. Generic universal pistons require manual orifice selection and can mis-meter refrigerant, risking compressor damage and lost performance. For warranty-sensitive and matched-system work, the OEM piston is the safe choice.

Installation Difficulty

Moderate — requires recovering refrigerant, opening the line set or coil, and EPA 608 certification. Recommended for licensed HVAC technicians.

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 fit my Goodman WGHP4336AAA Heat Pump — B1789868?

Yes. This is the factory-specified OEM piston for the Goodman WGHP4336AAA Heat Pump — B1789868. 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 WGHP4336AAA Heat Pump — B1789868?

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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