What are the specs for this Control Board?

The correct replacement for Tempstar model T4A424GKD100 – ComfortAlert Diagnostic | 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 T4A424GKD100 – ComfortAlert Diagnostic | Ships Today.

Is this control board 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 Control Board for T4A424GKD100 – ComfortAlert Diagnostic | Ships Today

Name: Tempstar Control Board for T4A424GKD100 – ComfortAlert Diagnostic | Ships Today
Brand: Tempstar
SKU: 1177402-GEN
Price: 164.95 USD
Availability: InStock

SKU: 1177402-GEN Brand: Tempstar

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Overview

This is the genuine OEM ComfortAlert control board (part #1177402) for the Tempstar T4A424GKD100 condensing unit. The ComfortAlert diagnostic module monitors compressor and electrical operation, detecting faults such as low/high pressure trips, locked rotor, open circuit, low voltage, and welded contactor conditions, then communicates them through a flashing diagnostic LED. It protects the compressor by interpreting run behavior and flagging problems before they cause catastrophic failure. When this board fails, you may see no diagnostics, erratic compressor behavior, false fault codes, or a compressor that won't run despite a good call for cooling. Replacing it restores both system control and the built-in fault reporting technicians rely on.

Specifications

Spec	Value
OEM Part Number	1177402
Type	ComfortAlert Diagnostic Control Board
Brand	Tempstar
Control Voltage	24 VAC
Function	Compressor Monitoring & Fault Diagnostics
Fitment	OEM Direct Replacement

Compatibility

Direct-fit OEM replacement for the Tempstar T4A424GKD100 condenser. Used across related ICP/Heil/Comfortmaker condensing units equipped with the ComfortAlert diagnostic platform. Verify the existing board is stamped 1177402 before installing.

Installation Guide

Safety First – Disconnect power at the outdoor disconnect and verify zero voltage with a multimeter before handling the board.
Access – Remove the condenser electrical access panel.
Document – Photograph every low-voltage and sensor connection and note the board's mounting orientation.
Remove – Unplug the connectors, release the standoff clips or screws, and lift the old board out.
Install – Seat the new board on its standoffs and reconnect every plug exactly per your photo.
Test – Restore power, call for cooling, and confirm normal operation and a steady (no-fault) diagnostic LED.

Signs You Need a Replacement

Diagnostic LED is dead, frozen, or flashing nonsensical codes.
Compressor won't start despite a verified 24V call for cooling.
Persistent false fault codes that clear when the board is bypassed.
Visible scorching, swollen components, or burnt-smelling traces on the board.

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 Control Board for T4A42...

$164.95

Frequently Asked Questions

Does this Control Board fit my Tempstar T4A424GKD100 – ComfortAlert Diagnostic | Ships Today?

Yes. This is the factory-specified OEM control board for the Tempstar T4A424GKD100 – ComfortAlert Diagnostic | 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 control board on my Tempstar T4A424GKD100 – ComfortAlert Diagnostic | Ships Today?

Difficulty: Advanced (1–2 hrs)
Step 1: Turn off breaker. Step 2: PHOTOGRAPH all wire connections before touching anything. Step 3: Label each wire with tape. Step 4: Disconnect all wires, remove old board. Step 5: Mount new board, reconnect all wires matching your photo exactly. Step 6: Restore power and test all modes. Exact part number match is critical.

My HVAC system is completely dead. What could be wrong?

Completely dead HVAC (no LED on board) = failed control board or blown fuse. Check board fuse first (3A or 5A, costs $1–$5). If fuse is good and board has power but no LED, board is dead. Always photograph wiring before replacing.

Is this control board 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 control board?

OEM essential. Control boards are model-specific with precise firmware and connector layouts. Aftermarket boards rarely match all functions and can cause intermittent failures or safety issues. Always match the exact OEM part number.

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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