What amp contactor do I need for my Tempstar system?

The correct replacement for Tempstar model TCA748GKA100 — 24V Coil w/Shunt | 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 Tempstar equipment which lists the model number TCA748GKA100 — 24V Coil w/Shunt | 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.

Is this contactor compatible with Bryant or Payne systems too?

Many Tempstar parts are cross-compatible with Bryant and Payne systems since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across multiple brand labels with different model numbers. To verify cross-compatibility, check your Bryant or Payne equipment service manual for cross-compatible part numbers, or contact info@nationalhvacparts.com with your model number for confirmation.

Tempstar

Tempstar 1-Pole 30A Contactor for TCA748GKA100 — 24V Coil w/Shunt | Ships Today

Name: Tempstar 1-Pole 30A Contactor for TCA748GKA100 — 24V Coil w/Shunt | Ships Today
Brand: Tempstar
SKU: 1172472-GEN
Price: 32.00 USD
Availability: InStock

SKU: 1172472-GEN Brand: Tempstar

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Overview

This genuine OEM definite purpose contactor (part number 1172472) is the main switching relay for the Tempstar TCA748GKA100 condensing unit. It is a 1-pole, 30-amp contactor with a 24V coil and an integrated shunt, used to energize the compressor and condenser fan whenever the thermostat calls for cooling. When the coil energizes, the contacts close and pass line voltage to the load. Over time the contacts pit, burn, and weld, while the coil can fail open — both conditions leave the outdoor unit dead or stuck running. A chattering or buzzing contactor and pulled-in contacts that won't release are classic symptoms of a worn unit.

Specifications

Spec	Value
Part Number	1172472
Type	Definite Purpose Contactor (1-Pole)
Brand	Tempstar
Rating	30 Amp
Coil Voltage	24V
Poles	1
Feature	Integrated shunt
Application	Compressor / condenser fan switching

Compatibility

Direct-fit replacement for the Tempstar TCA748GKA100 condensing unit and shared across many ICP-family outdoor units (Heil, Comfortmaker, Arcoaire) using the same 1-pole 30A 24V definite purpose contactor with shunt. Confirm pole count, amp rating, and coil voltage against your existing contactor before installing.

Installation Guide

Safety First — Disconnect power at the outdoor disconnect and verify zero voltage with a multimeter.
Access — Remove the control panel cover to expose the contactor.
Document — Photograph every line, load, and 24V coil wire before disconnecting.
Remove — Disconnect the leads, unscrew the contactor from its mounting base, and lift it out.
Install — Mount the new contactor and reconnect the line, load, and coil wires exactly per your photo, keeping the shunt connection intact.
Test — Restore power, call for cooling, and confirm the contactor pulls in cleanly and the compressor and fan start.

Signs You Need a Replacement

Contactor buzzes, chatters, or fails to pull in on a cooling call.
Contacts are pitted, burned, or welded closed so the unit won't shut off.
Outdoor unit is dead while the thermostat and transformer are good.
Visible arcing, melted housing, or a clicking coil that won't hold.

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

Tempstar 1-Pole 30A Contactor fo...

$32.00

Frequently Asked Questions

Does this Contactor fit my Tempstar TCA748GKA100 — 24V Coil w/Shunt | Ships Today?

Yes. This is the factory-specified OEM contactor for the Tempstar TCA748GKA100 — 24V Coil w/Shunt | 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 Tempstar TCA748GKA100 — 24V Coil w/Shunt | 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 Tempstar 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 Tempstar 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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