What amp contactor do I need for my ICP system?

The correct replacement for ICP model RGS121HSAA0AAAA — 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 RGS121HSAA0AAAA — 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 RGS121HSAA0AAAA — 24V Coil | Ships Today

Name: ICP 2-Pole 30A/40A Contactor for RGS121HSAA0AAAA — 24V Coil | Ships Today
Brand: ICP
SKU: 1178074-GEN
Price: 29.95 USD
Availability: InStock

SKU: 1178074-GEN Brand: ICP

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Overview

This OEM 2-pole contactor is the high-voltage switch that powers the major loads in your ICP RGS121HSAA0AAAA system. When the 24V control circuit energizes the coil, the contactor pulls in and closes its two power poles, sending line voltage to the compressor and/or condenser fan. Available in 30-amp (OEM part 1178074) and 40-amp (OEM part 1178211) ratings, both with a 24V coil. Contactor contacts pit, burn, and weld over thousands of cycles — a failing contactor is a leading cause of intermittent starting, chattering, and units that won't shut off.

Specifications

Spec	Value
30A Part Number	1178074
40A Part Number	1178211
Type	2-Pole Contactor
Poles	2
Amp Ratings	30A / 40A
Coil Voltage	24V
Brand	ICP / Tempstar / Heil
Fitment	OEM
Model	RGS121HSAA0AAAA

Compatibility

Fits the ICP / Tempstar / Heil RGS121HSAA0AAAA and related RGS-series units. Match the amp rating (30A or 40A) and confirm the 24V coil against your existing contactor before ordering.

Installation Guide

Safety First — Disconnect power at the breaker and disconnect, then verify zero voltage with a multimeter on all terminals.
Access — Remove the electrical access panel.
Document — Photo every wire and terminal position before disconnecting.
Remove — Transfer wires one at a time, or label them, then unscrew and remove the old contactor.
Install — Mount the new contactor, reconnect line, load, and 24V coil wires exactly per your photo.
Test — Restore power, call for cooling/heat, and confirm the contactor pulls in cleanly with no chatter.

Signs You Need a Replacement

Chattering or buzzing from the contactor
Pitted, burned, or welded contacts
Compressor or fan won't start, or won't shut off
Intermittent operation on hot days

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...

$29.95

Frequently Asked Questions

Does this Contactor fit my ICP RGS121HSAA0AAAA — 24V Coil | Ships Today?

Yes. This is the factory-specified OEM contactor for the ICP RGS121HSAA0AAAA — 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 RGS121HSAA0AAAA — 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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