What are the specs for this Control Board?

The correct replacement for Tempstar model T4A342GKD100 — ComfortAlert Diagnostics | 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 T4A342GKD100 — ComfortAlert Diagnostics | 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 T4A342GKD100 — ComfortAlert Diagnostics | Ships Today

Name: Tempstar Control Board for T4A342GKD100 — ComfortAlert Diagnostics | Ships Today
Brand: Tempstar
SKU: 1177402-GEN
Price: 184.95 USD
Availability: InStock

SKU: 1177402-GEN Brand: Tempstar

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Overview

This genuine OEM ComfortAlert control board (part number 1177402) is the diagnostic and protection module for your Tempstar T4A342GKD100 condensing unit. It continuously monitors compressor operation — voltage, current draw, and run behavior — and flashes coded fault signals so a technician can pinpoint problems like a locked rotor, open circuit, low voltage, or short cycling without guesswork. When this board fails, the system may lose compressor protection, ignore safety lockouts, or refuse to run entirely. Installing the correct factory board restores both the diagnostics and the built-in safeguards that extend compressor life.

Specifications

Spec	Value
Part Number	1177402
Type	ComfortAlert Diagnostic Control Board
Brand	Tempstar
Control Voltage	24V
Function	Compressor monitoring & fault diagnostics

Compatibility

Direct factory replacement for the Tempstar T4A342GKD100. The 1177402 ComfortAlert module is used across compatible ICP-family Tempstar, Heil, and Comfortmaker single-stage condensers and heat pumps. Match the existing board's part number and connector layout before installing.

Installation Guide

Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter before touching the control box.
Access — Remove the condenser service panel to reach the board.
Document — Photograph all wire harnesses and plug locations before disconnecting.
Remove — Unplug the connectors, release the mounting standoffs or screws, and lift out the old board.
Install — Seat the new board on its standoffs and reconnect each harness exactly per your photo.
Test — Restore power, call for cooling, and confirm the status LED shows normal operation with no fault codes.

Signs You Need a Replacement

No diagnostic LED activity or a board that stays dark on power-up.
Compressor won't start despite a good contactor, capacitor, and call for cooling.
Persistent or nonsensical fault codes that don't match field readings.
Visible scorching, swollen components, or a burnt-electronics smell on the board.

Shipping & Returns

Ships same day before 3 PM CST. 30-day returns. 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 T4A34...

$184.95

Frequently Asked Questions

Does this Control Board fit my Tempstar T4A342GKD100 — ComfortAlert Diagnostics | Ships Today?

Yes. This is the factory-specified OEM control board for the Tempstar T4A342GKD100 — ComfortAlert Diagnostics | 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 T4A342GKD100 — ComfortAlert Diagnostics | 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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