What amp contactor do I need for my ICP system?

The correct replacement for ICP model RGS121HEAB0AAAA — 30A/40A 24V Options | 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 RGS121HEAB0AAAA — 30A/40A 24V Options | 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 Contactor for RGS121HEAB0AAAA — 30A/40A 24V Options | Ships Today

Name: ICP 2-Pole Contactor for RGS121HEAB0AAAA — 30A/40A 24V Options | Ships Today
Brand: ICP
SKU: 1178074-GEN
Price: 32.00 USD
Availability: InStock

SKU: 1178074-GEN Brand: ICP

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Overview

This is a genuine ICP 2-pole definite purpose contactor for the Tempstar/Heil RGS121HEAB0AAAA system, available as a 30-amp model (OEM 1178074) or a 40-amp model (OEM 1178211), both with a 24-volt coil. The contactor is the electrically operated switch that energizes the compressor and condenser fan motor when the 24V control signal from the thermostat closes its coil. Its silver-alloy contacts carry high line-voltage current, so they eventually pit, burn, or weld from arcing. A failing contactor causes hard starting, chattering, no cooling, or a compressor that will not shut off. Choose the amp rating that matches your original part — never downsize.

Specifications

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

Compatibility

Fits the ICP/Tempstar/Heil RGS121HEAB0AAAA and related systems that use a 2-pole 24V contactor. Verify your existing contactor's amp rating (30A vs 40A) before ordering so the replacement matches the original load.

Installation Guide

Safety First — Disconnect power at the disconnect and breaker; verify zero voltage with a multimeter.
Access — Remove the unit's electrical access panel.
Document — Photograph all line, load, and coil wiring before disconnecting.
Remove — Label and disconnect each wire, then unscrew the old contactor from its mount.
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 and the compressor/fan energize on a cooling call.

Signs You Need a Replacement

Pitted, burned, or welded contacts
Chattering or buzzing when the unit calls for cooling
Compressor will not start or will not shut off
Visible arcing, melted housing, or no continuity across closed contacts

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 Contactor for RGS121H...

$32.00

Frequently Asked Questions

Does this Contactor fit my ICP RGS121HEAB0AAAA — 30A/40A 24V Options | Ships Today?

Yes. This is the factory-specified OEM contactor for the ICP RGS121HEAB0AAAA — 30A/40A 24V Options | 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 RGS121HEAB0AAAA — 30A/40A 24V Options | 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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