Tempstar ComfortAlert Control Board for T4A430GKD100 — OEM 1177402 | Ships Today
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Overview
The Tempstar 1177402 control board is an OEM ComfortAlert diagnostic module for the T4A430GKD100 condensing unit. This board monitors compressor and system operation — voltage, current, and run cycles — and flashes coded fault signals via an LED that let a technician quickly diagnose problems such as low/high pressure trips, locked rotor, open circuit, low line voltage, or short cycling. It also provides protection logic that helps prevent compressor damage. When the board fails, you may see no diagnostic LEDs, erratic or false fault codes, a compressor that won't run despite a good contactor and capacitor, or a unit that ignores protection delays. Installing the correct OEM ComfortAlert module restores both the protective control logic and the on-board troubleshooting capability.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1177402 |
| Type | ComfortAlert Diagnostic Control Board |
| Brand | Tempstar |
| Function | Compressor monitoring & fault diagnostics |
| Signaling | LED flash fault codes |
| Fit | OEM direct replacement |
Compatibility
This OEM ComfortAlert board is factory-specified for the Tempstar T4A430GKD100 air conditioner and other ICP-family units (Heil, Comfortmaker, Tempstar) that call out part number 1177402. Confirm the part number on your existing module before ordering, as diagnostic boards vary by platform.
Installation Guide
- Safety First — Disconnect power at the outdoor disconnect and verify zero voltage with a multimeter before opening the control box.
- Access — Remove the condenser electrical/service panel to reach the mounted board.
- Document — Photograph every connector and wire location on the board before disconnecting.
- Remove — Unplug the low-voltage and sensing leads, release the mounting standoffs/screws, and lift out the old board.
- Install — Snap the new board onto the standoffs and reconnect each lead exactly per your photo.
- Test — Restore power, call for cooling, and confirm the status LED shows normal operation with no fault codes.
Signs You Need a Replacement
- No diagnostic LED activity when the board is powered.
- False or constantly changing fault codes that don't match reality.
- Compressor won't start even with a good contactor, capacitor, and call for cooling.
- System short cycles or ignores normal protection/anti-short-cycle delays.
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