What are the specs for this Control Board?

The correct replacement for Tempstar model T4A342GKD200 — Diagnostic Defrost Board | 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 T4A342GKD200 — Diagnostic Defrost Board | 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 T4A342GKD200 — Diagnostic Defrost Board | Ships Today

Name: Tempstar Control Board ComfortAlert for T4A342GKD200 — Diagnostic Defrost Board | 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 ComfortAlert control board (part number 1177402) is the diagnostic defrost control for the Tempstar T4A342GKD200 heat pump. It governs the defrost cycle, monitors compressor health, and flashes fault codes through onboard LEDs to speed up troubleshooting. A failed board can leave the unit unable to defrost, short-cycling, locked out, or throwing erratic codes. Since it handles the 24V control logic, a bad board often mimics a compressor or motor failure even when those components are fine.

Specifications

Spec	Value
Part Number	1177402
Type	ComfortAlert Diagnostic Defrost Board
Brand	Tempstar (ICP / Heil)
Control Voltage	24V
Application	Heat Pump Condenser

Compatibility

Engineered for the Tempstar T4A342GKD200 and shared across many ICP-family heat pumps (Tempstar, Heil, Comfortmaker) using the ComfortAlert platform. Confirm OEM number 1177402 against 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 service panel.
Document — Photograph every wire and connector before disconnecting.
Remove — Release the low- and line-voltage plugs, unclip the board from its standoffs, and lift it out.
Install — Mount the new 1177402 board and reconnect each harness exactly per your photos.
Test — Restore power, check the diagnostic LEDs for a normal status, and verify a proper defrost and run cycle.

Signs You Need a Replacement

Unit fails to enter or exit defrost mode
Flashing or solid fault-code LEDs on the board
Compressor lockout or repeated short-cycling
No 24V output to the contactor with good incoming power

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...

$189.00

Frequently Asked Questions

Does this Control Board fit my Tempstar T4A342GKD200 — Diagnostic Defrost Board | Ships Today?

Yes. This is the factory-specified OEM control board for the Tempstar T4A342GKD200 — Diagnostic Defrost Board | 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 T4A342GKD200 — Diagnostic Defrost Board | 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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