What amp contactor do I need for my ICP system?

The correct replacement for ICP model RGS121LRAA0AAAA — 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 RGS121LRAA0AAAA — 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 RGS121LRAA0AAAA — 24V Coil | Ships Today

Name: ICP 2-Pole 30A Contactor for RGS121LRAA0AAAA — 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 OEM 2-pole, 30-amp definite purpose contactor (part #1178074) with a 24V control coil is the factory switching relay for the ICP / Heil / Tempstar RGS121LRAA0AAAA system. The contactor energizes the compressor and condenser fan load whenever the 24V thermostat circuit calls for cooling. Its contacts open and close thousands of times per season, and over time they pit, burn, weld shut, or chatter. A failed contactor is one of the most common no-cooling and won't-shut-off service calls. Symptoms include a humming or buzzing contactor, burnt or pitted contacts, a unit that won't start, or a system that keeps running after the thermostat is satisfied.

Specifications

Spec	Value
OEM Part Number	1178074
Type	2-Pole Definite Purpose Contactor
Brand	ICP / Heil / Tempstar
Rating	30 Amp
Coil Voltage	24V
Poles	2
Fits Model	RGS121LRAA0AAAA

Compatibility

Direct-fit replacement for the ICP/Heil/Tempstar RGS121LRAA0AAAA and other International Comfort Products units using a 2-pole 30A contactor with a 24V coil. Confirm pole count, amperage, and coil voltage before ordering.

Installation Guide

Safety First — Disconnect power at the disconnect and breaker; verify zero voltage with a multimeter.
Access — Remove the electrical access panel.
Document — Photograph all line, load, and 24V coil wiring before disconnecting.
Remove — Transfer wires one at a time, or label them, then unbolt the old contactor.
Install — Mount the new contactor and reconnect each wire to the matching terminal per your photo.
Test — Restore power and confirm the contactor pulls in on a cooling call and drops out when satisfied.

Signs You Need a Replacement

Buzzing, humming, or chattering contactor
Pitted, burnt, or welded contacts
Compressor/condenser won't start on a cooling call
System keeps 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 30A Contactor for RGS...

$28.95

Frequently Asked Questions

Does this Contactor fit my ICP RGS121LRAA0AAAA — 24V Coil | Ships Today?

Yes. This is the factory-specified OEM contactor for the ICP RGS121LRAA0AAAA — 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 RGS121LRAA0AAAA — 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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