Tempstar Control Board for T4A324GKD100 — Comfort Alert Diagnostics Module | Ships Today
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Overview
This OEM Comfort Alert control board (part number 1177402) is the diagnostic and protection module for the Tempstar T4A324GKD100 condensing unit. The board continuously monitors compressor and system operation, detects fault conditions such as long run cycles, locked rotor, low voltage, and short cycling, and communicates the condition through an on-board diagnostic LED. When this board fails, the system may refuse to start, short-cycle, throw false fault codes, or lose compressor protection entirely — leaving the unit vulnerable to costly damage. Replacing it with the genuine OEM board restores factory diagnostics and the manufacturer's protection logic.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1177402 |
| Type | Comfort Alert Diagnostics Control Board |
| Brand | Tempstar (ICP / Heil) |
| Function | Compressor monitoring & fault diagnostics |
| Fitment | OEM replacement |
Compatibility
Engineered as a direct OEM fit for the Tempstar T4A324GKD100 condensing unit and shared across compatible ICP-family (Heil, Comfortmaker, Tempstar) platforms that use the Comfort Alert module. Always confirm the printed part number 1177402 against your existing board before installing.
Installation Guide
- Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter.
- Access — Remove the condenser service panel to expose the control area.
- Document — Photograph every wire and terminal connection before disconnecting anything.
- Remove — Label and unplug the harness connections, release the mounting standoffs/screws, and lift out the old Comfort Alert board.
- Install — Seat the new board on the standoffs, secure it, and reconnect each lead exactly per your photo.
- Test — Restore power, confirm the diagnostic LED shows a normal status, and verify the unit starts and runs correctly.
Signs You Need a Replacement
- System will not start or short-cycles repeatedly
- Diagnostic LED is dark, flashing fault codes, or behaving erratically
- False trip conditions with no real fault present
- Loss of compressor protection or intermittent operation
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