What are the specs for this Control Board?

The correct replacement for Tempstar model T4A318GKD100 — 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 T4A318GKD100 — 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 T4A318GKD100 — ComfortAlert Diagnostics | Ships Today

Name: Tempstar Control Board for T4A318GKD100 — ComfortAlert Diagnostics | Ships Today
Brand: Tempstar
SKU: 1177402-GEN
Price: 189.00 USD
Availability: InStock

SKU: 1177402-GEN Brand: Tempstar

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Overview

This OEM Tempstar Control Board (part number 1177402) is a ComfortAlert diagnostic module that monitors and protects the compressor in your T4A318GKD100 air conditioning system. It continuously evaluates compressor and system conditions and flashes fault codes for issues such as low voltage, locked rotor, open circuits, missing phases, and short cycling. A failed board can cause the system to not start, run continuously, trip on protection faults, or show erratic or absent diagnostic LED codes. The exact OEM module restores dependable compressor protection and accurate field diagnostics.

Specifications

Spec	Value
Part Number	1177402
Type	ComfortAlert Diagnostic Control Board
Brand	Tempstar (ICP / Heil)
Function	Compressor monitoring & fault diagnostics
Control Voltage	24V
Fitment	OEM direct replacement

Compatibility

Engineered as the factory-correct control board for the Tempstar T4A318GKD100 condensing unit. This OEM ICP/Heil/Tempstar family part fits the matching ComfortAlert-equipped models that originally shipped with part 1177402.

Installation Guide

Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter.
Access — Remove the control access panel on the condensing unit.
Document — Photograph every wire and terminal location before disconnecting anything.
Remove — Label and unplug the low-voltage and sensor leads, release the board standoffs/mounting screws, and lift out the old board.
Install — Mount the new board on the standoffs and reconnect each lead exactly per your photo.
Test — Restore power, start the system, and confirm normal operation and a clear/healthy diagnostic LED status.

Signs You Need a Replacement

Compressor will not start or short cycles repeatedly
Persistent or false protection fault codes
Diagnostic LED is dark, frozen, or flashing erratically
Visible burn marks, corrosion, or swollen components 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 T4A31...

$189.00

Frequently Asked Questions

Does this Control Board fit my Tempstar T4A318GKD100 — ComfortAlert Diagnostics | Ships Today?

Yes. This is the factory-specified OEM control board for the Tempstar T4A318GKD100 — 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 T4A318GKD100 — 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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