What amp contactor do I need for my ICP system?

The correct replacement for ICP model RGS121HRBA0AAAA — 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 RGS121HRBA0AAAA — 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/40A Contactor for RGS121HRBA0AAAA — 24V Coil | Ships Today

Name: ICP 2-Pole 30A/40A Contactor for RGS121HRBA0AAAA — 24V Coil | Ships Today
Brand: ICP
SKU: 1178074-GEN
Price: 38.95 USD
Availability: InStock

SKU: 1178074-GEN Brand: ICP

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Overview

This OEM 2-pole definite purpose contactor is the switching relay that energizes the compressor and condenser fan in your ICP / Tempstar / Heil RGS121HRBA0AAAA system. When the thermostat calls for cooling, the 24V coil pulls the contacts closed and sends line voltage to the load. We stock both the 30-amp (1178074) and 40-amp (1178211) versions originally specified for this model. Contactors fail from pitted or welded contacts, a burned-out coil, or insect/debris intrusion that keeps the contacts from closing cleanly — symptoms include humming, chattering, a no-start condition, or a compressor that won't shut off.

Specifications

Spec	Value
Part Numbers	1178074 (30A), 1178211 (40A)
Type	2-Pole Definite Purpose Contactor
Brand	ICP (Tempstar / Heil)
Amp Rating	30A or 40A
Coil Voltage	24V
Poles	2
Fits Model	RGS121HRBA0AAAA

Compatibility

Direct OEM replacement for the ICP / Tempstar / Heil RGS121HRBA0AAAA. Confirm whether your unit uses the 30A (1178074) or 40A (1178211) contactor by checking the existing part number or the rating stamped on the old contactor before ordering.

Installation Guide

Safety First — Disconnect power at the breaker and the unit disconnect. Verify zero voltage with a multimeter.
Access — Remove the control/access panel to reach the contactor.
Document — Photograph all line, load, and 24V coil wiring before disconnecting.
Remove — Transfer wires one at a time or label them, unscrew the contactor from its bracket, and remove it.
Install — Mount the new contactor, reconnect each wire to the matching terminal per your photos.
Test — Restore power, call for cooling, and confirm the contactor pulls in and the compressor and fan start.

Signs You Need a Replacement

Loud humming, buzzing, or chattering from the contactor
Pitted, burned, or welded contacts visible on inspection
Compressor/fan won't start even with a 24V signal present
System runs continuously and won't cycle off

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/40A Contactor for...

$38.95

Frequently Asked Questions

Does this Contactor fit my ICP RGS121HRBA0AAAA — 24V Coil | Ships Today?

Yes. This is the factory-specified OEM contactor for the ICP RGS121HRBA0AAAA — 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 RGS121HRBA0AAAA — 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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