What amp contactor do I need for my ICP system?

The correct replacement for ICP model RGS121HDBA0AAAA — 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 RGS121HDBA0AAAA — 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 RGS121HDBA0AAAA — 30A/40A 24V Coil | Ships Today

Name: ICP 2-Pole Contactor for RGS121HDBA0AAAA — 30A/40A 24V Coil | Ships Today
Brand: ICP
SKU: 1178074
Price: 42.84 USD
Availability: InStock

SKU: 1178074 Brand: ICP

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Overview

This is the OEM 2-pole definite purpose contactor for the ICP / Tempstar / Heil RGS121HDBA0AAAA. The contactor is the electrically operated switch that energizes the compressor and condenser fan motor on a call for cooling. A 24V signal pulls in the coil, closing the high-voltage line contacts. Available in 30A (OEM 1178074) and 40A (OEM 1178211) ratings with a 24-volt coil. Pitted, welded, or chattering contacts commonly cause a unit that hums without starting, or one that runs nonstop because the contacts have fused closed.

Specifications

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

Compatibility

Engineered for the ICP/Tempstar/Heil RGS121HDBA0AAAA. Definite purpose contactors are widely interchangeable; confirm pole count, contact amperage, and 24V coil voltage against your existing part before ordering.

Installation Guide

Safety First — Disconnect power at the breaker and disconnect, then verify zero voltage with a multimeter at the contactor line terminals.
Access — Remove the unit's electrical access panel.
Document — Photograph all wires and terminal positions before disconnecting anything.
Remove — Label and remove line, load, and 24V coil wires; unscrew the old contactor from the bracket.
Install — Mount the new contactor and reconnect each wire exactly per your photo.
Test — Restore power and confirm the contactor pulls in on a cooling call and the compressor/fan start.

Signs You Need a Replacement

System hums or buzzes but compressor and fan won't start.
Visibly pitted, burned, or melted contacts.
Outdoor unit runs continuously because 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...

$42.84

Frequently Asked Questions

Does this Contactor fit my ICP RGS121HDBA0AAAA — 30A/40A 24V Coil | Ships Today?

Yes. This is the factory-specified OEM contactor for the ICP RGS121HDBA0AAAA — 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 RGS121HDBA0AAAA — 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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