What amp contactor do I need for my ICP system?

The correct replacement for ICP model RGS121HFCB0AAA — 24V 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 RGS121HFCB0AAA — 24V 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 Contactor for RGS121HFCB0AAA — 24V OEM | Ships Today

Name: ICP 2-Pole 30A & 40A Contactor for RGS121HFCB0AAA — 24V OEM | Ships Today
Brand: ICP
SKU: 1178074
Price: 45.44 USD
Availability: InStock

SKU: 1178074 Brand: ICP

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Overview

This OEM 2-pole definite purpose contactor for the ICP/Heil/Tempstar RGS121HFCB0AAA system is available as a 30-amp version (part #1178074) and a 40-amp version (part #1178211), both with a 24-volt control coil. The contactor is an electrically operated switch that closes when the 24V thermostat circuit calls, sending line power to the compressor and condenser fan motor. Contactor contacts pit, weld, or burn over thousands of cycles — a failed contactor is a leading cause of a unit that hums but won't start or won't shut off. A genuine OEM contactor restores clean, reliable switching.

Specifications

Spec	Value
30A Part Number	1178074 (Contactor 2P 30A 24V)
40A Part Number	1178211 (Contactor 2P 40A 24V)
Type	Definite Purpose Contactor
Poles	2-Pole
Contact Rating	30A / 40A
Coil Voltage	24V
Brand	ICP / Heil / Tempstar
Fits Model	RGS121HFCB0AAA
Application	Compressor / Condenser Fan Switching

Compatibility

Direct OEM replacement for the ICP RGS121HFCB0AAA and equivalent RGS-series units built under the Heil, Tempstar and Comfortmaker brands. Match the amp rating (30A or 40A) and the 24V coil to your existing contactor before ordering.

Installation Guide

Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter.
Access — Remove the electrical/service panel.
Document — Photograph all line, load, and 24V coil wires before disconnecting.
Remove — Label and transfer wires one at a time, then unbolt the old contactor.
Install — Mount the new contactor and reconnect each wire to the matching terminal per your photo.
Test — Restore power and confirm the contactor pulls in on a call and drops out when satisfied.

Signs You Need a Replacement

Unit hums but compressor/fan won't start
Burned, pitted, or welded contacts
Chattering or buzzing contactor
System won't shut off when the thermostat is satisfied

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 Contactor f...

$45.44

Frequently Asked Questions

Does this Contactor fit my ICP RGS121HFCB0AAA — 24V OEM | Ships Today?

Yes. This is the factory-specified OEM contactor for the ICP RGS121HFCB0AAA — 24V 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 RGS121HFCB0AAA — 24V 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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