What amp contactor do I need for my ICP system?

The correct replacement for ICP model RGS121HECA0AAA — 30A & 40A 24V Coil 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 RGS121HECA0AAA — 30A & 40A 24V Coil 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 RGS121HECA0AAA — 30A & 40A 24V Coil Options | Ships Today

Name: ICP 2-Pole Contactor for RGS121HECA0AAA — 30A & 40A 24V Coil Options | Ships Today
Brand: ICP
SKU: 1178074-GEN
Price: 32.95 USD
Availability: InStock

SKU: 1178074-GEN Brand: ICP

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Overview

This OEM definite-purpose contactor is the direct-fit switching relay for the ICP Tempstar / Heil RGS121HECA0AAA system, available in 2-pole 30-amp (part 1178074) and 2-pole 40-amp (part 1178211) ratings, both with a 24V control coil. The contactor is the electromechanical switch that energizes the compressor and condenser fan when the thermostat calls for cooling — the 24V coil pulls the contacts closed, passing line voltage to the load. Contactors are high-cycle, high-current parts, so their contacts pit, burn, and weld over time. A failed contactor is one of the most common no-cooling service calls: pitted contacts cause hard starts and chatter, while welded contacts leave the compressor running even after the call ends.

Specifications

Spec	Value
Part Number	1178074 (30A), 1178211 (40A)
Type	Definite-purpose contactor, 2-pole
Poles	2
Contact Rating	30A or 40A
Coil Voltage	24V
Brand	ICP / Tempstar / Heil
Fits Model	RGS121HECA0AAA

Compatibility

Fits the ICP RGS121HECA0AAA system and shared Tempstar, Heil, and Comfortmaker units. Match your existing contactor's amp rating, pole count, and 24V coil voltage before ordering — choose the 30A or 40A version to match the original.

Installation Guide

Safety First — Disconnect power at the disconnect and breaker. Verify zero voltage with a multimeter.
Access — Remove the electrical access panel on the condensing unit.
Document — Photograph all line, load, and coil wiring before disconnecting.
Remove — Transfer wires one at a time or unbolt the old contactor from its mount.
Install — Mount the new contactor, reconnect line, load, and 24V coil leads exactly per your photo.
Test — Restore power, call for cooling, and confirm the contacts pull in cleanly with no chatter.

Signs You Need a Replacement

Pitted, burnt, or welded contacts
Buzzing or chattering at the contactor
Compressor/fan won't start, or keeps running after the call ends
Visible arcing or scorch marks on the terminals

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...

$32.95

Frequently Asked Questions

Does this Contactor fit my ICP RGS121HECA0AAA — 30A & 40A 24V Coil Options | Ships Today?

Yes. This is the factory-specified OEM contactor for the ICP RGS121HECA0AAA — 30A & 40A 24V Coil 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 RGS121HECA0AAA — 30A & 40A 24V Coil 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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