What amp contactor do I need for my ICP system?

The correct replacement for ICP model RGS121HDCA0AAA — 24V Coil | 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 RGS121HDCA0AAA — 24V Coil | 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 40A Contactor for RGS121HDCA0AAA — 24V Coil | Ships Today

Name: ICP 2-Pole 40A Contactor for RGS121HDCA0AAA — 24V Coil | Ships Today
Brand: ICP
SKU: 1178074-GEN
Price: 29.95 USD
Availability: InStock

SKU: 1178074-GEN Brand: ICP

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Overview

This OEM 2-pole definite-purpose contactor (part #1178074 / #1178211) is the electrical switch that energizes the compressor and condenser fan motor in your ICP RGS121HDCA0AAA system. When the 24V control signal reaches the coil, the contactor pulls in and closes the line-voltage contacts that power the outdoor unit. Rated for 40A at 24V coil voltage, it handles the high inrush current of compressor start-up cycle after cycle. Failure symptoms include a unit that won't start, a buzzing or chattering outdoor unit, pitted or welded contacts, and a compressor that runs continuously because the contacts have fused closed.

Specifications

Spec	Value
Part Number	1178074 / 1178211
Type	2-Pole Definite Purpose
Brand	ICP (Heil / Tempstar)
Amp Rating	40A
Coil Voltage	24V

Compatibility

Designed for the ICP / Heil / Tempstar RGS121HDCA0AAA gas furnace and matched condensing units. Always confirm your existing contactor's pole count, amp rating, and coil voltage before installing.

Installation Guide

Safety First — Disconnect power at the breaker and disconnect, verify zero voltage with a multimeter.
Access — Remove the outdoor unit's electrical service panel.
Document — Photograph all wire positions before disconnecting.
Remove — Note line and load wire placement, release the contactor from its mounting bracket, and transfer wires one at a time.
Install — Mount the new contactor and reconnect each wire per your photo.
Test — Restore power and confirm the contactor pulls in on a call for cooling.

Signs You Need a Replacement

Loud buzzing or chattering from the outdoor unit
Burnt, pitted, or welded contacts
Outdoor unit won't start on a cooling call
Compressor runs nonstop (contacts stuck closed)

Shipping & Returns

Ships same day before 3 PM CST. 30-day returns. 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 40A Contactor for RGS...

$29.95

Frequently Asked Questions

Does this Contactor fit my ICP RGS121HDCA0AAA — 24V Coil | Ships Today?

Yes. This is the factory-specified OEM contactor for the ICP RGS121HDCA0AAA — 24V Coil | 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 RGS121HDCA0AAA — 24V Coil | 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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