What amp contactor do I need for my ICP system?

The correct replacement for ICP model RGS121LTBA0AAAA — OEM 1178074 | 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 RGS121LTBA0AAAA — OEM 1178074 | 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 30A Contactor 24V Coil for RGS121LTBA0AAAA — OEM 1178074 | Ships Today

Name: ICP 2-Pole 30A Contactor 24V Coil for RGS121LTBA0AAAA — OEM 1178074 | Ships Today
Brand: ICP
SKU: 1178074
Price: 37.70 USD
Availability: InStock

SKU: 1178074 Brand: ICP

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Overview

This OEM 2-pole, 30-amp contactor (1178074) with a 24-volt coil switches line voltage to the major loads on your ICP/Heil/Tempstar RGS121LTBA0AAAA system. When the 24V control circuit energizes the coil, the contactor pulls in and closes both poles to power the load; when the call ends, the contacts open. Over time the contacts pit, burn, and weld from arcing, while the coil can fail open — symptoms include a unit that won't start, chatters, or runs continuously even after the thermostat is satisfied.

Specifications

Spec	Value
Part Number	1178074
Type	Definite Purpose Contactor
Poles	2-Pole
Contact Rating	30 Amps
Coil Voltage	24V
Brand	ICP / Heil / Tempstar
Fits Model	RGS121LTBA0AAAA
Fit	OEM

Compatibility

Fits the ICP RGS121LTBA0AAAA and related Heil, Tempstar, and Comfortmaker units using a 2-pole 30A contactor with a 24V coil. Confirm pole count, amp rating, and coil voltage match your existing contactor before ordering.

Installation Guide

Safety First — Disconnect power at the disconnect and furnace switch; verify zero voltage with a multimeter.
Access — Remove the electrical/control compartment service panel.
Document — Photograph every line, load, and 24V coil wire before disconnecting.
Remove — Transfer wires one at a time or label them, then unbolt the old contactor.
Install — Mount the new 2-pole contactor and reconnect each wire to the matching terminal per your photo.
Test — Restore power, call for operation, and confirm the contactor pulls in cleanly with no chatter.

Signs You Need a Replacement

Unit won't start or only runs intermittently
Buzzing, chattering, or humming from the contactor
Pitted, burned, or welded contacts
System keeps running after the thermostat is satisfied

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 30A Contactor 24V Coi...

$37.70

Frequently Asked Questions

Does this Contactor fit my ICP RGS121LTBA0AAAA — OEM 1178074 | Ships Today?

Yes. This is the factory-specified OEM contactor for the ICP RGS121LTBA0AAAA — OEM 1178074 | 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 RGS121LTBA0AAAA — OEM 1178074 | 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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