What amp contactor do I need for my ICP system?

The correct replacement for ICP model RGS121LFBA0AAAA — OEM 1178074 | 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 RGS121LFBA0AAAA — OEM 1178074 | 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 24V for RGS121LFBA0AAAA — OEM 1178074 | Ships Today

Name: ICP 2-Pole 30A Contactor 24V for RGS121LFBA0AAAA — OEM 1178074 | Ships Today
Brand: ICP
SKU: 1178074
Price: 44.20 USD
Availability: InStock

SKU: 1178074 Brand: ICP

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Overview

This OEM 2-pole 30-amp definite-purpose contactor (part number 1178074) with a 24-volt coil is the primary switching relay for the ICP RGS121LFBA0AAAA system. When the thermostat calls for cooling, the 24V coil pulls in the contacts, sending line power to the compressor and condenser fan motor. Contactors fail from pitted, welded, or burned contacts and from weak coils that chatter or won't pull in. A failing contactor causes no-cool calls, buzzing at the unit, or a system that won't shut off. Replacing it with the exact OEM part restores reliable switching.

Specifications

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

Compatibility

Fits the ICP RGS121LFBA0AAAA and shared-platform Tempstar, Heil, and Comfortmaker units that use the 2-pole 30A 24V contactor. Verify part number 1178074 and the coil voltage against your unit before ordering.

Installation Guide

Safety First — Disconnect power at the disconnect and breaker. Verify zero voltage with a multimeter across the line terminals.
Access — Remove the unit's electrical access panel to expose the contactor.
Document — Photograph every wire and terminal position before disconnecting.
Remove — Label and disconnect the line, load, and 24V coil wires, then unscrew the old contactor from its bracket.
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 cleanly with no chatter or arcing.

Signs You Need a Replacement

Pitted, blackened, or welded contacts
Loud buzzing or chattering at the outdoor unit
System fails to start or won't shut off on cooling
Coil won't energize even with 24V present

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 24V for...

$44.20

Frequently Asked Questions

Does this Contactor fit my ICP RGS121LFBA0AAAA — OEM 1178074 | Ships Today?

Yes. This is the factory-specified OEM contactor for the ICP RGS121LFBA0AAAA — OEM 1178074 | 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 RGS121LFBA0AAAA — OEM 1178074 | 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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