What amp contactor do I need for my ICP system?

The correct replacement for ICP model RGS121HSBA0AAAA — 24V Coil 30A/40A | 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 RGS121HSBA0AAAA — 24V Coil 30A/40A | 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 RGS121HSBA0AAAA — 24V Coil 30A/40A | Ships Today

Name: ICP 2-Pole Contactor for RGS121HSBA0AAAA — 24V Coil 30A/40A | 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 OEM 2-pole definite-purpose contactor for the ICP / Tempstar / Heil RGS121HSBA0AAAA furnace and matched condensing unit. The contactor is the electromechanical switch that energizes the compressor and outdoor fan motor whenever the thermostat calls for cooling. Its 24-volt control coil pulls in two line-voltage poles, completing the high-voltage circuit. This listing covers both the 30-amp (OEM 1178074) and 40-amp (OEM 1178211) versions so you can match the exact ampere rating stamped on your failed part. A worn contactor is one of the most common HVAC no-cool failures — symptoms include a buzzing or chattering outdoor unit, contacts that weld shut leaving the compressor running constantly, or pitted/burnt contacts that prevent the unit from starting at all.

Specifications

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

Compatibility

Fits ICP RGS121HSBA0AAAA and other Tempstar, Heil, Comfortmaker, and Carrier-family equipment using a 2-pole 24V-coil contactor. Confirm the amperage stamped on your existing contactor before ordering.

Installation Guide

Safety First — Disconnect power at the breaker and the outdoor disconnect, then verify zero voltage with a multimeter.
Access — Remove the outdoor unit's service panel.
Document — Photograph every wire on the existing contactor before disconnecting.
Remove — Unscrew the contactor from its bracket and transfer wires one at a time to the matching terminals on the new part.
Install — Mount the new contactor, reconnect each wire per your photo, and confirm the 24V coil leads are landed.
Test — Restore power, call for cooling, and verify the contactor pulls in cleanly with no chatter.

Signs You Need a Replacement

Buzzing or chattering outdoor unit
Pitted, burnt, or welded contacts
Compressor runs even with the thermostat off
Outdoor unit will not start on a cooling call

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 RGS121HSBA0AAAA — 24V Coil 30A/40A | Ships Today?

Yes. This is the factory-specified OEM contactor for the ICP RGS121HSBA0AAAA — 24V Coil 30A/40A | 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 RGS121HSBA0AAAA — 24V Coil 30A/40A | 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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