What amp contactor do I need for my ICP system?

The correct replacement for ICP model RGS121HSCB0AAA — OEM | 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 RGS121HSCB0AAA — OEM | Ships Today.

My AC clicks but the compressor does not turn on. What is wrong?

Clicking from the outdoor unit without the compressor starting usually means a worn contactor. The contactor is the relay that sends power to the compressor. When its contacts are pitted or worn, it clicks but cannot establish a solid electrical connection. Other symptoms: visible pitting or burn marks on the contactor face, AC works intermittently, or buzzing from the contactor.

ICP

ICP 2-Pole 30A & 40A 24V Contactor for RGS121HSCB0AAA — OEM | Ships Today

Name: ICP 2-Pole 30A & 40A 24V Contactor for RGS121HSCB0AAA — OEM | Ships Today
Brand: ICP
SKU: 1178074
Price: 44.20 USD
Availability: InStock

SKU: 1178074 Brand: ICP

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Overview

This genuine OEM 2-pole definite-purpose contactor switches line power to the compressor and condenser fan motor on the ICP/Tempstar/Heil RGS121HSCB0AAA system. A 24V coil pulls the contacts closed when the thermostat calls for cooling, energizing the high-voltage circuit. Available in 30-amp (part #1178074) and 40-amp (part #1178211) ratings — select the amperage that matches your unit's original contactor. Pitted, welded, or chattering contacts are one of the most common HVAC failures, causing no-cool conditions, hard starts, or a compressor that won't shut off.

Specifications

Spec	Value
Part Numbers	1178074 (30A), 1178211 (40A)
Type	2-Pole Definite Purpose Contactor
Poles	2
Contact Rating	30A / 40A
Coil Voltage	24V
Brand	ICP / Tempstar / Heil
Fits Model	RGS121HSCB0AAA

Compatibility

Fits the ICP-family RGS121HSCB0AAA and related Tempstar, Heil, and Comfortmaker units using a 2-pole 24V-coil contactor. Confirm whether your original is rated 30A or 40A and order the matching part number.

Installation Guide

Safety First — Disconnect power at the breaker and the outdoor disconnect. Verify zero voltage with a multimeter.
Access — Remove the condensing unit service panel.
Document — Photograph every wire on the contactor before disconnecting.
Remove — Label and remove the line, load, and coil wires, then unscrew the old contactor from its bracket.
Install — Mount the new contactor and reconnect each wire to the same terminal per your photo.
Test — Restore power and confirm the contacts pull in on a cooling call and drop out when satisfied.

Signs You Need a Replacement

Burnt, pitted, or welded contacts
Loud humming or chattering from the contactor
Compressor and fan won't start on a cooling call
System won't shut off because contacts are stuck closed

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 2-Pole 30A & 40A 24V Contact...

$44.20

Frequently Asked Questions

Does this Contactor fit my ICP RGS121HSCB0AAA — OEM | Ships Today?

Yes. This is the factory-specified OEM contactor for the ICP RGS121HSCB0AAA — OEM | 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 contactor on my ICP RGS121HSCB0AAA — OEM | Ships Today?

Difficulty: Medium (30–45 min)
Step 1: Turn off breaker. Step 2: Open condensing unit panel. Step 3: Photograph ALL wiring on the contactor. Step 4: Label each wire with tape. Step 5: Disconnect wires and remove old contactor. Step 6: Mount new contactor, reconnect wires matching your photo. Step 7: Restore power and test.

My AC clicks but the compressor won’t turn on. What’s wrong?

Clicking from the outdoor unit without the compressor starting = worn contactor. The contactor sends power to the compressor. When its contacts are pitted, it clicks but can’t make solid contact. Look for: visible pitting/burn marks on the contactor face, intermittent operation, or buzzing.

Is this contactor 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 contactor?

OEM recommended for reliability and warranty compatibility. OEM parts match exact factory specifications for proper fit, performance, and safety. While aftermarket alternatives cost less upfront, the risk of improper fit and reduced lifespan usually makes OEM the better value long-term.

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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