What amp contactor do I need for my ICP system?

The correct replacement for ICP model RGS121HTCA0AAA — 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 RGS121HTCA0AAA — 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 RGS121HTCA0AAA — 30A/40A 24V Coil | Ships Today

Name: ICP 2-Pole Contactor for RGS121HTCA0AAA — 30A/40A 24V Coil | Ships Today
Brand: ICP
SKU: 1178074
Price: 45.44 USD
Availability: InStock

SKU: 1178074 Brand: ICP

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Overview

This is a genuine OEM 2-pole definite purpose contactor for the ICP / Tempstar / Heil RGS121HTCA0AAA gas furnace and matched condensing unit. The contactor is the electrically operated switch that energizes the compressor and condenser fan motor whenever the thermostat calls for cooling. A 24-volt control signal pulls in the coil, closing the line-voltage contacts and powering the outdoor unit. Available in 30-amp (OEM part 1178074) and 40-amp (OEM part 1178211) ratings, both with a 24V coil. When a contactor fails the most common symptoms are an outdoor unit that hums but will not start, pitted or welded contacts that keep the compressor running, or no response at all from the condenser when cooling is demanded.

Specifications

Spec	Value
Part Number	1178074 (30A) / 1178211 (40A)
Type	2-Pole Definite Purpose Contactor
Brand	ICP / Tempstar / Heil
Contact Rating	30 Amp or 40 Amp
Coil Voltage	24 VAC
Poles	2
Fitment	OEM Direct Replacement

Compatibility

Direct-fit replacement for the ICP / Tempstar / Heil model RGS121HTCA0AAA and many shared-platform Carrier, Bryant, Comfortmaker and Arcoaire condensing units that use a 24V 2-pole contactor. Confirm your existing contactor's amp rating (30A vs 40A) and that the coil is 24V before ordering.

Installation Guide

Safety First — Disconnect power at the outdoor disconnect and the furnace breaker, then verify zero voltage across the contacts with a multimeter.
Access — Remove the condenser service panel to expose the electrical compartment.
Document — Photograph every wire and terminal position before disconnecting anything.
Remove — Label and disconnect the line, load and 24V coil wires, then unscrew the old contactor from its bracket.
Install — Mount the new contactor, reconnect each wire exactly per your photo, and confirm the coil terminals match.
Test — Restore power and call for cooling; verify the contactor pulls in cleanly and the compressor and fan start.

Signs You Need a Replacement

Outdoor unit hums or chatters but the compressor will not start.
Burnt, pitted or welded contacts visible on the old part.
Compressor keeps running after the thermostat is satisfied (stuck closed).
Buzzing contactor or intermittent cooling 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 Contactor for RGS121H...

$45.44

Frequently Asked Questions

Does this Contactor fit my ICP RGS121HTCA0AAA — 30A/40A 24V Coil | Ships Today?

Yes. This is the factory-specified OEM contactor for the ICP RGS121HTCA0AAA — 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 RGS121HTCA0AAA — 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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