What amp contactor do I need for my ICP system?

The correct replacement for ICP model RGS121SRCA0AAA — 24V Coil OEM 1178074 | 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 RGS121SRCA0AAA — 24V Coil OEM 1178074 | 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 Contactor for RGS121SRCA0AAA — 24V Coil OEM 1178074 | Ships Today

Name: ICP 2-Pole 30A Contactor for RGS121SRCA0AAA — 24V Coil OEM 1178074 | Ships Today
Brand: ICP
SKU: 1178074-GEN
Price: 32.00 USD
Availability: InStock

SKU: 1178074-GEN Brand: ICP

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Overview

This is the OEM 2-pole 30-amp contactor (part number 1178074) with a 24V coil for the ICP / Tempstar / Heil RGS121SRCA0AAA system. The contactor is an electrically controlled switch: when the 24V control circuit energizes its coil, the contacts close and pass line voltage to the connected load. Over time the contacts pit, burn, and weld, and the coil can fail open — leaving the equipment unable to start, or stuck running. Replacing it with this OEM-rated 30A, 24V-coil, 2-pole contactor restores clean, reliable switching.

Specifications

Spec	Value
OEM Part Number	1178074
Type	Contactor, 2-Pole
Brand	ICP / Tempstar / Heil
Contact Rating	30A
Coil Voltage	24V
Poles	2
Fits Model	RGS121SRCA0AAA

Compatibility

Direct OEM replacement for the ICP, Tempstar, Heil and Comfortmaker RGS121SRCA0AAA system. Confirm a 2-pole layout, 30A contact rating, and 24V coil match your existing contactor before installing.

Installation Guide

Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter.
Access — Remove the electrical-compartment service panel.
Document — Photograph every line, load, and coil connection before disconnecting.
Remove — Transfer wires one at a time, then unbolt and remove the old contactor.
Install — Mount the new contactor and reconnect each wire exactly as photographed.
Test — Restore power and confirm the coil pulls in and the contacts pass voltage on a call.

Signs You Need a Replacement

Loud humming or buzzing from the contactor coil.
Pitted, burned, or welded contacts that stay closed.
Equipment fails to start even though the coil receives 24V.
Visible arcing, melting, or insect/debris fouling on the contacts.

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 Contactor for RGS...

$32.00

Frequently Asked Questions

Does this Contactor fit my ICP RGS121SRCA0AAA — 24V Coil OEM 1178074 | Ships Today?

Yes. This is the factory-specified OEM contactor for the ICP RGS121SRCA0AAA — 24V Coil OEM 1178074 | 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 RGS121SRCA0AAA — 24V Coil OEM 1178074 | 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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