What are the specs for this Control Board?

The correct replacement for Tempstar model T4A448GKD200 — 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 T4A448GKD200 — 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 Comfort Alert Control Board for T4A448GKD200 — OEM 1177402 | Ships Today

Name: Tempstar Comfort Alert Control Board for T4A448GKD200 — OEM 1177402 | Ships Today
Brand: Tempstar
SKU: 1177402-GEN
Price: 189.00 USD
Availability: InStock

SKU: 1177402-GEN Brand: Tempstar

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Overview

This is the genuine OEM Comfort Alert control board (part number 1177402) for the Tempstar T4A448GKD200 heat pump. The board manages compressor sequencing, defrost timing, and fault diagnostics, and its onboard Comfort Alert module flashes diagnostic codes that pinpoint the fault for the technician. When it fails the system may refuse to start, run continuously, fail to enter or exit defrost, or throw repeated flash codes. Installing the correct OEM board restores reliable staging and equipment protection.

Specifications

Spec	Value
Part Number	1177402
Type	Comfort Alert Control / Defrost Board
Brand	Tempstar (ICP / Heil)
Function	Compressor control, defrost timing, fault diagnostics
Fitment	OEM replacement

Compatibility

Engineered for the Tempstar T4A448GKD200 heat pump and shared across compatible ICP / Heil / Comfortmaker units that use the 1177402 Comfort Alert board. Always confirm your existing board's part number before ordering.

Installation Guide

Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter.
Access — Remove the unit's control/service panel.
Document — Photograph all wire and harness connections before disconnecting.
Remove — Unplug each harness, release the board standoffs/screws, and lift out the old board.
Install — Mount the new board on the standoffs and reconnect every harness exactly per your photo.
Test — Restore power and verify the unit stages, runs, and enters/exits defrost normally with no fault codes.

Signs You Need a Replacement

System will not start or short-cycles with no clear cause
Repeated Comfort Alert diagnostic flash codes
Unit fails to enter or exit defrost in cold weather
Burnt, corroded, or visibly cracked board components

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 Comfort Alert Control B...

$189.00

Frequently Asked Questions

Does this Control Board fit my Tempstar T4A448GKD200 — OEM 1177402 | Ships Today?

Yes. This is the factory-specified OEM control board for the Tempstar T4A448GKD200 — 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 T4A448GKD200 — 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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