What MFD capacitor do I need for my Goodman AC?

The correct replacement for Goodman model ASH130181A — B94578700 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 ASH130181A — B94578700.

My AC hums but will not start. What part do I need?

An AC that hums but will not start is the classic symptom of a failed capacitor. The capacitor provides the electrical boost needed to start the compressor and fan motors. When it fails, you hear the hum of the motor trying to start but it cannot overcome inertia. Other symptoms include the fan spinning slowly, the AC cycling on and off rapidly, or a visibly swollen or leaking capacitor. Replacement cost: $15 to $80 for the part, DIY in 30 minutes.

Is this capacitor 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 30/5 MFD 370V Run Capacitor for ASH130181A — B94578700

Name: OEM Goodman 30/5 MFD 370V Run Capacitor for ASH130181A — B94578700
Brand: Goodman
SKU: GOODMAN-15921
Price: 24.95 USD
Availability: InStock

SKU: GOODMAN-15921 Brand: Goodman

$24.95 $32.95

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Goodman B94578700 Dual Run Capacitor — 30/5 MFD, 370V

The Goodman B94578700 is a genuine OEM dual run capacitor rated at 30/5 MFD (microfarad) and 370 volts, built for the ASH130181A heat pump. A dual run capacitor provides the phase shift that both the compressor (30 MFD side) and the condenser fan motor (5 MFD side) need to start and run smoothly. A weak or bulging capacitor is the single most common cause of a condenser that hums but won't start, or a fan that spins slowly.

OEM Part Number: B94578700
Capacitance: 30/5 MFD (dual)
Voltage Rating: 370 VAC
Terminals: HERM (compressor), FAN, and C (common)
Shape: Round, 50/60 Hz
Fits: Goodman ASH130181A and compatible 13 SEER condensers

OEM vs. Generic

A quality 440V generic capacitor of the same 30/5 MFD rating will fit as an up-rated substitute (a higher voltage rating is acceptable). However, the OEM B94578700 is matched exactly to Goodman's tolerance and terminal layout, so it drops in without rewiring. For a guaranteed exact match with factory reliability, choose OEM.

Installation Difficulty

Rating: Easy (15–20 minutes). Shut off power at the disconnect, discharge the old capacitor across its terminals with an insulated screwdriver, photograph the wiring, then transfer the HERM, FAN, and C leads to the matching terminals. No refrigerant work is involved. Always confirm power is off before touching terminals — capacitors store a lethal charge.

Ships as a genuine Goodman OEM part with a fit guarantee.

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 30/5 MFD 370V Run Ca...

$24.95

Frequently Asked Questions

Does this Capacitor fit my Goodman ASH130181A — B94578700?

Yes. This is the factory-specified OEM capacitor for the Goodman ASH130181A — B94578700. 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 capacitor on my Goodman ASH130181A — B94578700?

Difficulty: Easy (20–30 min)
Step 1: Turn off power at breaker. Step 2: Open condensing unit panel. Step 3: Photograph the old capacitor wiring (Common/Herm/Fan). Step 4: Discharge old capacitor with insulated screwdriver. Step 5: Disconnect and remove old capacitor. Step 6: Mount new capacitor, reconnect wires to matching terminals. Step 7: Close panel, restore power, test. Tools: screwdriver, needle-nose pliers.

My AC hums but won’t start. What part do I need?

An AC that hums but won’t start is the classic symptom of a failed capacitor. The capacitor provides the electrical boost to start the compressor. When it fails, you hear humming but the motor can’t overcome inertia. Other symptoms: fan spinning slowly, AC cycling on/off rapidly, or a visibly swollen capacitor. Fix: replace capacitor ($15–$80 DIY, 30 min).

Is this capacitor 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 capacitor?

OEM strongly recommended. OEM capacitors have ±6% MFD tolerance vs aftermarket ±10%. The looser tolerance causes motor winding stress, higher temps, and shorter compressor life. Price difference is only $10–$20 — OEM is the clear value choice.

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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