What amp contactor do I need for my ICP system?

The correct replacement for ICP model RGS121HDAB0AAAA — 30A/40A 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 RGS121HDAB0AAAA — 30A/40A 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 Contactor for RGS121HDAB0AAAA — 30A/40A 24V Coil | Ships Today

Name: ICP 2-Pole Contactor for RGS121HDAB0AAAA — 30A/40A 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 definite-purpose contactor for the ICP/Tempstar/Heil RGS121HDAB0AAAA is available in a 30-amp version (part 1178074) and a 40-amp version (part 1178211), both with a 24V control coil. The contactor is the high-voltage switch that energizes the compressor and condenser fan when the 24V thermostat signal closes the coil. Two poles break both legs of the line voltage for safe, reliable switching. Over time the contact points pit, arc, and weld from the inrush current — a failing contactor causes a system that won't start, chatters, or won't shut off because the contacts have fused closed. Match the amp rating to the contactor you are replacing.

Specifications

Spec	Value
Part Number	1178074 (30A) / 1178211 (40A)
Type	2-Pole Definite Purpose Contactor
Brand	ICP / Heil / Tempstar / Comfortmaker
Contact Rating	30A or 40A
Coil Voltage	24V
Poles	2
Application	AC Compressor / Condenser Fan Switching
Fitment	OEM Direct Replacement

Compatibility

Designed for the ICP RGS121HDAB0AAAA and the Tempstar, Heil, and Comfortmaker systems using a 2-pole 24V-coil contactor. Verify both the amp rating and OEM part number (1178074 or 1178211) against your existing contactor before ordering.

Installation Guide

Safety First — Disconnect power at the disconnect and breaker; verify zero voltage with a multimeter.
Access — Remove the control panel cover.
Document — Photo every line, load, and coil wire before disconnecting.
Remove — Transfer wires one at a time, or label them, then unscrew the old contactor.
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 compressor starts.

Signs You Need a Replacement

System won't start or only starts intermittently
Loud buzzing or chattering from the contactor
Pitted, blackened, or welded contact points
Compressor won't shut off (contacts fused closed)

Shipping & Returns

Ships same day on orders placed 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...

$28.95

Frequently Asked Questions

Does this Contactor fit my ICP RGS121HDAB0AAAA — 30A/40A 24V Coil | Ships Today?

Yes. This is the factory-specified OEM contactor for the ICP RGS121HDAB0AAAA — 30A/40A 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 RGS121HDAB0AAAA — 30A/40A 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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