What are the specs for this Control Board?

The correct replacement for Tempstar model T4A442GKD100 — ComfortAlert Diagnostic Module | 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 T4A442GKD100 — ComfortAlert Diagnostic Module | 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 T4A442GKD100 — ComfortAlert Diagnostic Module | Ships Today

Name: Tempstar Control Board for T4A442GKD100 — ComfortAlert Diagnostic Module | Ships Today
Brand: Tempstar
SKU: 1177402-GEN
Price: 189.95 USD
Availability: InStock

SKU: 1177402-GEN Brand: Tempstar

OEM Guaranteed

Same-Day Ship

30-Day Returns

Secure Checkout

Texas CMBL #19328542014

SAM.gov Registered

Govt POs Accepted

Overview

This genuine OEM ComfortAlert control board (part number 1177402) is the diagnostic and protection module for the Tempstar T4A442GKD100 condensing unit. The ComfortAlert board continuously monitors the compressor's electrical signature to detect faults such as locked rotor, open circuit, low voltage, short cycling, and welded contactor conditions. It drives a status LED that flashes fault codes a technician can read, helping pinpoint problems without tearing the system apart. When this board fails, the outdoor unit may stop responding to cooling calls, throw erroneous fault codes, or lose protective shutdown functions.

Specifications

Spec	Value
Part Number	1177402
Type	ComfortAlert Compressor Diagnostic Control Board
Brand	Tempstar (OEM)
Control Voltage	24V
Function	Compressor monitoring, fault-code diagnostics, protection

Compatibility

Designed for the Tempstar T4A442GKD100 and other ICP / Tempstar / Heil / Comfortmaker outdoor units equipped with the 1177402 ComfortAlert module. Verify the printed part number on your existing board before ordering.

Installation Guide

Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter.
Access — Remove the condenser control-box service panel.
Document — Photograph every wire and harness plug before disconnecting.
Remove — Unplug the low-voltage harnesses and release the board from its standoffs or mounting screws.
Install — Mount the new board, reconnect every harness to match your photo, and seat each connector fully.
Test — Restore power, call for cooling, and confirm the status LED shows a normal run condition.

Signs You Need a Replacement

Outdoor unit will not start despite a good contactor and capacitor.
Status LED is dark, stuck on, or flashing nonsensical codes.
Compressor short-cycles or trips protection with no real fault present.
Visible burn marks, corrosion, or swollen components on the board.

Shipping & Returns

Ships same day on orders placed before 3 PM CST. 30-day returns on unused parts. 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 T4A44...

$189.95

Frequently Asked Questions

Does this Control Board fit my Tempstar T4A442GKD100 — ComfortAlert Diagnostic Module | Ships Today?

Yes. This is the factory-specified OEM control board for the Tempstar T4A442GKD100 — ComfortAlert Diagnostic Module | 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 T4A442GKD100 — ComfortAlert Diagnostic Module | 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.

Menu