What amp contactor do I need for my ICP system?

The correct replacement for ICP model RGS121HSCA0AAA — OEM Replacement | 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 RGS121HSCA0AAA — OEM Replacement | 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 RGS121HSCA0AAA — OEM Replacement | Ships Today

Name: ICP 2-Pole 30A/40A 24V Contactor for RGS121HSCA0AAA — OEM Replacement | Ships Today
Brand: ICP
SKU: 1178074-GEN
Price: 34.00 USD
Availability: InStock

SKU: 1178074-GEN Brand: ICP

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Overview

This OEM 2-pole definite-purpose contactor is the magnetic switch that powers the compressor and condenser fan circuit in your ICP / Tempstar / Heil RGS121HSCA0AAA system. A 24-volt signal from the thermostat energizes the coil, pulling the contacts closed to feed line voltage to the load. Available in the factory 30-amp (part 1178074) and 40-amp (part 1178211) ratings, both with a 24V coil. Contactors fail from pitted or welded contacts, a burned-out coil, or insects and debris holding the contacts open — symptoms include a system that won't start, chattering, or a compressor that runs continuously.

Specifications

Spec	Value
Part Numbers	1178074 (30A), 1178211 (40A)
Type	2-Pole Definite Purpose Contactor
Brand	ICP / Tempstar / Heil
Contact Rating	30A / 40A
Coil Voltage	24V
Poles	2
Fits Model	RGS121HSCA0AAA

Compatibility

Designed for the ICP-family RGS121HSCA0AAA and the shared Tempstar, Heil, and Comfortmaker condensing units. Match your existing contactor's amperage and coil voltage before ordering — both common ratings are offered here.

Installation Guide

Safety First — Disconnect power at the disconnect and breaker. Verify zero voltage with a multimeter.
Access — Remove the condensing unit electrical access panel.
Document — Photograph all line, load, and coil wiring before disconnecting.
Remove — Label and disconnect the wires, then unbolt the old contactor from the bracket.
Install — Mount the new contactor and reconnect each wire exactly per your photo.
Test — Restore power and confirm the contacts pull in on a cooling call with no chatter.

Signs You Need a Replacement

System won't start or hums without engaging
Chattering or buzzing at the contactor
Pitted, burned, or welded contacts
Compressor runs even after 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 24V Contactor...

$34.00

Frequently Asked Questions

Does this Contactor fit my ICP RGS121HSCA0AAA — OEM Replacement | Ships Today?

Yes. This is the factory-specified OEM contactor for the ICP RGS121HSCA0AAA — OEM Replacement | 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 RGS121HSCA0AAA — OEM Replacement | 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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