What MFD capacitor do I need for my ICP AC?

The correct replacement for ICP model RGS121LDAB0AAAA — 370/440V Blower Capacitor | Ships Today 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 ICP equipment which lists the model number RGS121LDAB0AAAA — 370/440V Blower Capacitor | Ships Today.

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.

ICP

ICP Run Capacitor 7.5 MFD for RGS121LDAB0AAAA — 370/440V Blower Capacitor | Ships Today

Name: ICP Run Capacitor 7.5 MFD for RGS121LDAB0AAAA — 370/440V Blower Capacitor | Ships Today
Brand: ICP
SKU: 1171842
Price: 27.30 USD
Availability: InStock

SKU: 1171842 Brand: ICP

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Overview

This OEM run capacitor assembly fits the ICP / Tempstar / Heil RGS121LDAB0AAAA gas furnace and supplies the steady phase shift the blower motor needs to start and run efficiently. Rated at 7.5 MFD and 370/440V, the capacitor stores and releases energy on each cycle to keep the motor turning smoothly. The kit includes OEM boot capacitor part 1171842 and oval clamp part 1171552 for a secure, factory-correct mount. A weak or failed capacitor is one of the most common furnace blower faults — when capacitance drops, the motor draws excess current, overheats, hums without starting, or trips the limit. Replacing it restores full airflow and protects the motor windings from premature failure.

Specifications

Spec	Value
OEM Part Numbers	1171842 (Boot), 1171552 (Oval Clamp)
Type	Single Run Capacitor
Brand	ICP / Tempstar / Heil
Capacitance	7.5 MFD
Voltage	370/440V
Application	Furnace Blower Motor

Compatibility

Engineered for the ICP RGS121LDAB0AAAA furnace and other RGS-series gas furnaces sharing the same blower assembly. Always confirm the MFD and voltage rating printed on your existing capacitor before installing.

Installation Guide

Safety First — Disconnect power at the furnace switch and breaker, then verify zero voltage with a multimeter.
Access — Remove the blower compartment service panel.
Document — Photograph all wire connections before disconnecting.
Remove — Discharge the old capacitor across its terminals with an insulated screwdriver, then unclip the oval clamp and pull the leads.
Install — Mount the new capacitor in the boot and clamp, reconnect the leads per your photo.
Test — Restore power and confirm the blower starts promptly and runs quietly.

Signs You Need a Replacement

Blower hums but will not start
Furnace blower starts slowly or stalls
Visible bulging, leaking, or swollen capacitor top
Measured capacitance below the rated 7.5 MFD

Shipping & Returns

Ships same day before 3 PM CST. 30-day returns. Backed by the National HVAC Parts fitment 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

ICP Run Capacitor 7.5 MFD for RG...

$27.30

Frequently Asked Questions

Does this Capacitor fit my ICP RGS121LDAB0AAAA — 370/440V Blower Capacitor | Ships Today?

Yes. This is the factory-specified OEM capacitor for the ICP RGS121LDAB0AAAA — 370/440V Blower Capacitor | Ships Today. 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 ICP RGS121LDAB0AAAA — 370/440V Blower Capacitor | Ships Today?

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 ICP 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 ICP 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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