What are the specs for this Control Board?

The correct replacement for Tempstar model TXA642GKA100 — OEM 1177402 | 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 TXA642GKA100 — OEM 1177402 | 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 ComfortAlert for TXA642GKA100 — OEM 1177402 | Ships Today

Name: Tempstar Control Board ComfortAlert for TXA642GKA100 — OEM 1177402 | Ships Today
Brand: Tempstar
SKU: 1177402-GEN
Price: 149.95 USD
Availability: InStock

SKU: 1177402-GEN Brand: Tempstar

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Overview

The Tempstar 1177402 ComfortAlert control board is the OEM diagnostic and compressor-protection module for the TXA642GKA100 condensing unit. This board continuously monitors compressor and system operation, flashing fault codes that pinpoint problems such as locked rotor, open circuit, low voltage, and short cycling. When this board fails, the outdoor unit may not start, may trip on protection faults, or may run without proper compressor protection — risking expensive compressor damage. Replacing it with the genuine OEM 1177402 restores accurate diagnostics and factory-grade safeguarding.

Specifications

Spec	Value
Part Number	1177402
Type	ComfortAlert Control / Diagnostic Board
Brand	Tempstar (ICP / Heil)
Function	Compressor monitoring & fault-code diagnostics
Fits Model	TXA642GKA100
Fitment	OEM Direct Replacement

Compatibility

Designed for the Tempstar TXA642GKA100 air conditioner/heat pump condensing unit and equivalent ICP-family (Heil, Comfortmaker) systems that originally shipped with the 1177402 ComfortAlert module. Always confirm the 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 control-panel service cover on the condensing unit.
Document — Photograph all wiring and connector positions before disconnecting anything.
Remove — Unplug the low-voltage connectors and release the board from its standoffs/mounting clips.
Install — Snap the new 1177402 board onto the standoffs and reconnect every wire exactly per your photo.
Test — Restore power, start a cooling cycle, and confirm the diagnostic LED shows normal operation with no fault codes.

Signs You Need a Replacement

Outdoor unit will not start or compressor won't engage
Persistent or erratic fault-code LED flashes
Frequent short cycling or nuisance protection trips
No diagnostic LED activity with power confirmed at 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 ComfortAl...

$149.95

Frequently Asked Questions

Does this Control Board fit my Tempstar TXA642GKA100 — OEM 1177402 | Ships Today?

Yes. This is the factory-specified OEM control board for the Tempstar TXA642GKA100 — OEM 1177402 | 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 TXA642GKA100 — OEM 1177402 | 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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