What amp contactor do I need for my ICP system?

The correct replacement for ICP model RGS121LFCB0AAA — Definite Purpose | 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 RGS121LFCB0AAA — Definite Purpose | 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 24V Contactor for RGS121LFCB0AAA — Definite Purpose | Ships Today

Name: ICP 2-Pole 30A 24V Contactor for RGS121LFCB0AAA — Definite Purpose | Ships Today
Brand: ICP
SKU: 1178074
Price: 41.60 USD
Availability: InStock

SKU: 1178074 Brand: ICP

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Overview

This OEM 2-pole definite-purpose contactor (part 1178074) for the ICP / Heil / Tempstar RGS121LFCB0AAA system is rated 30 amps with a 24-volt control coil. The contactor is the high-current switch that energizes the compressor and/or condenser fan motor when the thermostat calls for cooling: a 24V signal pulls the coil in, closing the two power poles and passing line voltage to the load. Contactors are among the most common failure points in HVAC systems because the contacts arc every time they open and close, leading to pitting, welding, and chatter. A failed contactor shows up as a system that will not start, contacts that stick closed (compressor running continuously), or a loud buzzing from the coil.

Specifications

Spec	Value
Part Number	1178074
Type	Definite Purpose Contactor
Poles	2-Pole
Contact Rating	30 Amps
Coil Voltage	24V
Brand	ICP (Heil / Tempstar / Comfortmaker)
Fits Model	RGS121LFCB0AAA
Fitment	OEM exact-fit replacement

Compatibility

Fits the ICP-built RGS121LFCB0AAA and related Heil, Tempstar, and Comfortmaker units calling for a 2-pole, 30A, 24V-coil contactor. Confirm pole count, amp rating, and coil voltage before installing.

Installation Guide

Safety First — Disconnect power at the disconnect and breaker; verify zero voltage with a multimeter.
Access — Remove the electrical access panel on the unit.
Document — Photograph every line, load, and 24V coil wire before disconnecting.
Remove — Label and disconnect the wires, then unbolt the old contactor from its mounting.
Install — Mount the new contactor and reconnect each wire to the matching terminal per your photo.
Test — Restore power, call for cooling, and confirm the contactor pulls in and the load energizes.

Signs You Need a Replacement

System will not start on a cooling call
Pitted, burned, or welded contacts (compressor runs nonstop)
Loud buzzing or chattering from the contactor coil
Visible arcing or melted terminals

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 30A 24V Contactor for...

$41.60

Frequently Asked Questions

Does this Contactor fit my ICP RGS121LFCB0AAA — Definite Purpose | Ships Today?

Yes. This is the factory-specified OEM contactor for the ICP RGS121LFCB0AAA — Definite Purpose | 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 RGS121LFCB0AAA — Definite Purpose | 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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