What amp contactor do I need for my ICP system?

The correct replacement for ICP model RGS121STCA0AAA — 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 RGS121STCA0AAA — 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 30A Contactor for RGS121STCA0AAA — 24V Coil | Ships Today

Name: ICP 2-Pole 30A Contactor for RGS121STCA0AAA — 24V Coil | Ships Today
Brand: ICP
SKU: 1178074-GEN
Price: 28.95 USD
Availability: InStock

SKU: 1178074-GEN Brand: ICP

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Overview

This genuine OEM 2-pole, 30-amp definite purpose contactor (part 1178074) with a 24-volt coil for the ICP/Tempstar/Heil RGS121STCA0AAA switches power to the compressor and condenser fan motor. When the thermostat calls for cooling, the 24V coil energizes and pulls the contacts closed to pass line voltage to the load. Contactors are high-wear parts: their contacts pit, burn, and weld over time, and the coil can fail open. A worn contactor causes hard starts, chattering, buzzing, or a system that won't start at all.

Specifications

Spec	Value
Part Number	1178074
Type	Definite Purpose Contactor, 2-Pole
Brand	ICP / Tempstar / Heil
Contact Rating	30 Amps
Coil Voltage	24 VAC
Poles	2
Fit	OEM Direct Replacement

Compatibility

Built for the ICP RGS121STCA0AAA and a wide range of Tempstar, Heil, and Comfortmaker condensing units that use a 2-pole 30A contactor with a 24V coil. Verify amp rating, pole count, and coil voltage against your old contactor before installing.

Installation Guide

Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter.
Access — Remove the condenser service panel to expose the contactor.
Document — Photograph every wire on the line, load, and coil terminals before disconnecting.
Remove — Label and disconnect the wires, then unscrew the old contactor from its mount.
Install — Mount the new contactor and reconnect all wires exactly per your photos.
Test — Restore power, call for cooling, and confirm the contactor pulls in and the compressor and fan run.

Signs You Need a Replacement

Loud buzzing, humming, or chattering from the contactor
Pitted, burned, or welded contacts that stick closed
Compressor or condenser fan won't start on a cooling call
Coil that no longer pulls the contacts in when energized

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...

$28.95

Frequently Asked Questions

Does this Contactor fit my ICP RGS121STCA0AAA — 24V Coil | Ships Today?

Yes. This is the factory-specified OEM contactor for the ICP RGS121STCA0AAA — 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 RGS121STCA0AAA — 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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