What amp contactor do I need for my ICP system?

The correct replacement for ICP model RGS121HFCA0AAA – 30A/40A 24V | 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 RGS121HFCA0AAA – 30A/40A 24V | 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 Contactor for RGS121HFCA0AAA – 30A/40A 24V | Ships Today

Name: ICP 2-Pole Contactor for RGS121HFCA0AAA – 30A/40A 24V | 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 for the ICP Tempstar Heil RGS121HFCA0AAA is available in 30-amp (part 1178074) and 40-amp (part 1178211) ratings, both with a 24-volt control coil. The contactor is the electrically operated switch that energizes the compressor and condenser fan motor whenever the thermostat calls for cooling. When the 24V coil is energized, the two poles close and pass line voltage to the outdoor unit. Over thousands of cycles, the contacts pit, burn, and weld, causing failure to start, chattering, or a unit that won't shut off. Replacing a worn contactor is one of the most common and reliable HVAC repairs.

Specifications

Spec	Value
Part Numbers	1178074 (30A), 1178211 (40A)
Type	2-Pole Definite Purpose Contactor
Coil Voltage	24V
Amperage	30A / 40A
Poles	2
Brand	ICP / Tempstar / Heil
Fits Model	RGS121HFCA0AAA
Fitment	OEM Direct Replacement

Compatibility

Fits the ICP Tempstar Heil RGS121HFCA0AAA and related ICP-family condensing units. Choose the 30A or 40A variant to match your existing contactor rating, and confirm a 24V coil. Always match poles (2) and FLA/LRA requirements of your compressor.

Installation Guide

Safety First – Disconnect power at the outdoor disconnect and breaker; verify zero voltage with a multimeter.
Access – Remove the condenser electrical access panel.
Document – Photograph all line, load, and 24V coil wires before disconnecting.
Remove – Transfer wires one at a time, or unbolt and remove the old contactor.
Install – Mount the new contactor and reconnect every wire exactly per your photo.
Test – Restore power, call for cooling, and confirm the contactor pulls in cleanly and the unit runs.

Signs You Need a Replacement

Pitted, burned, or welded contacts
Humming or chattering at the outdoor unit
Compressor/fan won't start on a cooling call
Unit continues running 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 Contactor for RGS121H...

$29.95

Frequently Asked Questions

Does this Contactor fit my ICP RGS121HFCA0AAA – 30A/40A 24V | Ships Today?

Yes. This is the factory-specified OEM contactor for the ICP RGS121HFCA0AAA – 30A/40A 24V | 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 RGS121HFCA0AAA – 30A/40A 24V | 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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