What MFD capacitor do I need for my ICP AC?

The correct replacement for ICP model RGS243LFFA0AAAA — Blower Motor | 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 RGS243LFFA0AAAA — Blower Motor | 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 5 MFD 370V for RGS243LFFA0AAAA — Blower Motor | Ships Today

Name: ICP Run Capacitor 5 MFD 370V for RGS243LFFA0AAAA — Blower Motor | Ships Today
Brand: ICP
SKU: 1183001
Price: 22.04 USD
Availability: InStock

SKU: 1183001 Brand: ICP

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Overview

This is a genuine OEM run capacitor (part number 1183001, "Capacitor Plate") for the ICP / Tempstar / Heil RGS243LFFA0AAAA gas furnace. The capacitor provides the phase-shifted current the blower motor needs to start and run smoothly and efficiently. Rated at 5 MFD and 370 volts, it stores and releases energy on each cycle to keep the indoor blower motor torque steady. When a run capacitor weakens or fails, the blower may hum without starting, start slowly, overheat, or trip on thermal overload — leaving the furnace unable to deliver conditioned air.

Specifications

Spec	Value
Part Number	1183001
Type	Single Run Capacitor
Brand	ICP / Tempstar / Heil
Capacitance	5 MFD
Voltage	370V
Application	Furnace Blower Motor
Fitment	OEM Replacement

Compatibility

Engineered as a direct OEM fit for the ICP RGS243LFFA0AAAA gas furnace and equivalent Tempstar, Heil, Comfortmaker, and Carrier-family models built on the same blower platform. Always confirm the printed MFD and voltage rating 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. Capacitors hold a charge — discharge with an insulated resistor before touching terminals.
Access — Remove the furnace blower compartment service panel.
Document — Photograph all wire connections before disconnecting anything.
Remove — Note the lead positions, pull the spade connectors off the old capacitor, and loosen the mounting strap or plate.
Install — Mount the new 5 MFD 370V capacitor, secure the strap, and reconnect the leads exactly per your photo.
Test — Restore power and confirm the blower starts promptly and runs without humming or overheating.

Signs You Need a Replacement

Blower motor hums but will not start spinning.
Blower starts slowly or struggles to reach full speed.
Bulged, leaking, or burst capacitor top.
Furnace runs but airflow is weak or the motor overheats and trips.

Shipping & Returns

Ships same day on orders placed before 3 PM CST. 30-day hassle-free 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 5 MFD 370V for...

$22.04

Frequently Asked Questions

Does this Capacitor fit my ICP RGS243LFFA0AAAA — Blower Motor | Ships Today?

Yes. This is the factory-specified OEM capacitor for the ICP RGS243LFFA0AAAA — Blower Motor | 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 RGS243LFFA0AAAA — Blower Motor | 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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