What amp contactor do I need for my ICP system?

The correct replacement for ICP model RGS121HFAA0AAAA — 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 RGS121HFAA0AAAA — 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 RGS121HFAA0AAAA — 30A/40A 24V Coil | Ships Today

Name: ICP 2-Pole Contactor for RGS121HFAA0AAAA — 30A/40A 24V Coil | Ships Today
Brand: ICP
SKU: 1178074-GEN
Price: 24.95 USD
Availability: InStock

SKU: 1178074-GEN Brand: ICP

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Overview

This OEM 2-pole definite purpose contactor is the primary switching relay for the ICP/Tempstar/Heil RGS121HFAA0AAAA gas furnace and its matched condensing unit. When the thermostat calls for cooling, the 24-volt control coil energizes and pulls in the contactor, closing the line-voltage contacts that feed the compressor and condenser fan motor. Available in both 30-amp (OEM 1178074) and 40-amp (OEM 1178211) ratings, it is one of the most common failure points in any HVAC system because the contacts arc and erode every time they open and close. A failed contactor is the leading cause of a unit that hums but will not start, or one that runs continuously because the contacts have welded shut. Pitted, burned, or chattering contacts cause hard starting, voltage drop, and premature compressor wear.

Specifications

Spec	Value
Part Numbers	1178074 (30A), 1178211 (40A)
Type	2-Pole Definite Purpose Contactor
Brand	ICP / Heil / Tempstar
Contact Rating	30A and 40A options
Coil Voltage	24 VAC
Poles	2

Compatibility

Designed as a direct OEM replacement for the ICP, Heil, Tempstar, and Comfortmaker RGS121HFAA0AAAA model and matched outdoor condensing units. Confirm the original coil voltage is 24V and select the amp rating that matches your existing part.

Installation Guide

Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter.
Access — Remove the service panel from the condensing unit or furnace.
Document — Photograph all line, load, and 24V coil wires before disconnecting.
Remove — Transfer wires one at a time to the new contactor, or unbolt the old contactor from its bracket and remove.
Install — Mount the new contactor and reconnect each wire to match your photo, confirming the 24V coil leads land on the coil terminals.
Test — Restore power, call for cooling, and verify the contactor pulls in cleanly with no chatter.

Signs You Need a Replacement

Unit hums or buzzes but the compressor and fan will not start.
Contacts are visibly pitted, burned, or blackened.
System runs continuously because the contacts are welded closed.
Loud chattering or clicking when the thermostat calls for cooling.

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...

$24.95

Frequently Asked Questions

Does this Contactor fit my ICP RGS121HFAA0AAAA — 30A/40A 24V Coil | Ships Today?

Yes. This is the factory-specified OEM contactor for the ICP RGS121HFAA0AAAA — 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 RGS121HFAA0AAAA — 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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