What are the specs for this Control Board?

The correct replacement for Tempstar model T4A348GKN200 — 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 T4A348GKN200 — 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 T4A348GKN200 — ComfortAlert Diagnostic Module | Ships Today

Name: Tempstar Control Board for T4A348GKN200 — ComfortAlert Diagnostic Module | 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 a genuine OEM ComfortAlert control board (part number 1177402) for the Tempstar T4A348GKN200 condensing unit. The ComfortAlert diagnostic module continuously monitors compressor and system electrical conditions, controls compressor operation, and flashes fault codes that pinpoint issues such as locked rotor, open circuit, low voltage, and short cycling. When the board fails, the system may refuse to start, short cycle, display false fault codes, or run the compressor without protection. Installing the exact OEM module restores factory diagnostics and protects your compressor.

Specifications

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

Compatibility

Engineered as a direct-fit replacement for the Tempstar T4A348GKN200 condensing unit and shared ICP, Heil, Comfortmaker, and Carrier-family platforms that use the 1177402 ComfortAlert module. Always confirm your existing board part number before ordering.

Installation Guide

Safety First — Disconnect power at the breaker and disconnect, then verify zero voltage with a multimeter.
Access — Remove the control panel access cover on the condensing unit.
Document — Photograph all wire connections and terminal positions before disconnecting anything.
Remove — Label and disconnect the low-voltage and line connections, then unclip or unscrew the failed board from its standoffs.
Install — Mount the new board on the standoffs and reconnect every wire to match your photos exactly.
Test — Restore power, start a cooling cycle, and confirm the status LED shows normal operation with no fault flashes.

Signs You Need a Replacement

System will not start or compressor never energizes
Status LED is dark, stuck, or flashing erratic/false fault codes
Compressor short cycles or runs without protection
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 T4A34...

$189.00

Frequently Asked Questions

Does this Control Board fit my Tempstar T4A348GKN200 — ComfortAlert Diagnostic Module | Ships Today?

Yes. This is the factory-specified OEM control board for the Tempstar T4A348GKN200 — 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 T4A348GKN200 — 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.

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