What are the specs for this Refrigerant Control?

The correct replacement for Goodman model GMPV100-3 — 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 GMPV100-3 — B1789865.

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Goodman

OEM Goodman Refrigerant Piston / Flowrator Kit for GMPV100-3 — B1789865

Name: OEM Goodman Refrigerant Piston / Flowrator Kit for GMPV100-3 — B1789865
Brand: Goodman
SKU: GOODMAN-12142
Price: 6.95 USD
Availability: InStock

SKU: GOODMAN-12142 Brand: Goodman

$6.95 $9.95

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The Goodman B1789865 Piston Kit is the OEM refrigerant metering piston (flowrator) for the Goodman/Amana GMPV100-3 packaged unit. This small but critical component meters liquid refrigerant into the evaporator coil, maintaining the correct pressure drop and superheat for efficient cooling. A worn, wrong-size, or debris-clogged piston causes poor cooling, high head pressure, or coil freeze-ups — this kit restores factory metering.

Specifications

Component: Fixed-orifice refrigerant piston (flowrator)
Application: Liquid-line metering device
Compatible refrigerants: Per Goodman unit spec (R-410A / R-22 platform)
Includes: Piston and seal(s) as applicable
Fits: Goodman/Amana GMPV100-3 packaged units
OEM Part Number: B1789865

OEM vs. Generic

The OEM Goodman B1789865 is bored to the exact orifice diameter Goodman rates for this unit's capacity, which is essential for correct charge and efficiency. Generic pistons come in assorted bore sizes and require you to match the number precisely — an incorrect bore hurts capacity and can damage the compressor. For metering accuracy, the OEM piston is the safe choice.

Installation

Difficulty: Advanced (HVAC pro recommended). Requires recovering refrigerant, opening the liquid line, replacing the piston, evacuating, and recharging by weight. EPA Section 608 certification is required to handle refrigerant. Not a DIY job unless you are certified and equipped.

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 Refrigerant Control fit my Goodman GMPV100-3 — B1789865?

Yes. This is the factory-specified OEM refrigerant control for the Goodman GMPV100-3 — 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 refrigerant control on my Goodman GMPV100-3 — B1789865?

Difficulty: Advanced (1–2 hrs)
Step 1: Turn off breaker. Step 2: PHOTOGRAPH all wire connections before touching anything. Step 3: Label each wire with tape. Step 4: Disconnect all wires, remove old board. Step 5: Mount new board, reconnect all wires matching your photo exactly. Step 6: Restore power and test all modes. Exact part number match is critical.

My HVAC system is completely dead. What could be wrong?

Completely dead HVAC (no LED on board) = failed control board or blown fuse. Check board fuse first (3A or 5A, costs $1–$5). If fuse is good and board has power but no LED, board is dead. Always photograph wiring before replacing.

Is this refrigerant control 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 refrigerant control?

OEM essential. Control boards are model-specific with precise firmware and connector layouts. Aftermarket boards rarely match all functions and can cause intermittent failures or safety issues. Always match the exact OEM part number.

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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