What MFD capacitor do I need for my ICP AC?

The correct replacement for ICP model RGS121HRCA0AAA — 7.5 MFD 370V | 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 RGS121HRCA0AAA — 7.5 MFD 370V | 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 Blower Motor Run Capacitor for RGS121HRCA0AAA — 7.5 MFD 370V | Ships Today

Name: ICP Blower Motor Run Capacitor for RGS121HRCA0AAA — 7.5 MFD 370V | Ships Today
Brand: ICP
SKU: 1171842-GEN
Price: 24.95 USD
Availability: InStock

SKU: 1171842-GEN Brand: ICP

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Overview

This OEM run capacitor keeps the blower motor in your ICP Tempstar Heil RGS121HRCA0AAA gas furnace spinning at the correct speed and torque. Rated at 7.5 MFD and 370 volts, it provides the steady phase shift the PSC blower motor needs to start and run efficiently. Kit includes the capacitor boot (OEM 1171842) and oval mounting clamp (OEM 1171552) for a complete, code-correct installation. When a run capacitor weakens or fails, the blower may hum without starting, run hot, cycle on thermal overload, or stop moving air entirely — leaving you with no heat delivery even though the burners fire.

Specifications

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

Compatibility

Engineered for the ICP / Tempstar / Heil / Comfortmaker RGS121HRCA0AAA gas furnace and other units in the same blower-motor family. Always confirm the MFD and voltage rating stamped on your existing capacitor before installing.

Installation Guide

Safety First — Disconnect power at the furnace switch and breaker; verify zero voltage with a multimeter and discharge the capacitor across its terminals before touching.
Access — Remove the furnace blower-compartment service panel.
Document — Photograph all wire connections before disconnecting anything.
Remove — Note terminal positions, pull the spade connectors, loosen the oval clamp, and lift out the old capacitor.
Install — Seat the new capacitor in the clamp, fit the boot, and reconnect leads exactly per your photo.
Test — Restore power and confirm the blower starts cleanly and ramps to full speed.

Signs You Need a Replacement

Blower motor hums but will not start
Bulging, leaking, or swollen capacitor top
Weak airflow or motor running hot
Furnace trips on blower thermal overload

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 Blower Motor Run Capacitor f...

$24.95

Frequently Asked Questions

Does this Capacitor fit my ICP RGS121HRCA0AAA — 7.5 MFD 370V | Ships Today?

Yes. This is the factory-specified OEM capacitor for the ICP RGS121HRCA0AAA — 7.5 MFD 370V | 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 RGS121HRCA0AAA — 7.5 MFD 370V | 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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