Tempstar Comfort Alert Control Board for T4A448GKD100 — OEM Diagnostic Module | Ships Today
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Overview
This is a genuine OEM Comfort Alert control board (part #1177402) for the Tempstar T4A448GKD100 condensing unit. The Comfort Alert module is a compressor diagnostic and protection board that continuously monitors compressor operation, voltage conditions, and run/start performance. It provides fault-code diagnostics through an onboard LED, protecting the compressor from damaging conditions such as low voltage, locked rotor, open circuits, and short cycling. When this board fails or malfunctions, the system may lose protective shutoff features, throw erroneous fault codes, or fail to start the compressor entirely. A working Comfort Alert board extends compressor life and dramatically speeds up field troubleshooting.
Specifications
| Spec | Value |
|---|---|
| OEM Part Number | 1177402 |
| Type | Comfort Alert Diagnostic Control Board |
| Brand | Tempstar |
| Function | Compressor monitoring & protection |
| Control Voltage | 24V |
| Diagnostics | LED fault-code indication |
Compatibility
This OEM control board is a direct-fit replacement for the Tempstar T4A448GKD100 air conditioning condensing unit and is used across the ICP family of single-stage condensers (Heil, Comfortmaker, and related brands) that employ the Comfort Alert diagnostic module. Confirm your existing board part number before ordering.
Installation Guide
- Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter before servicing.
- Access — Remove the electrical access panel to expose the control area.
- Document — Photograph all low-voltage and sensing connections on the existing board before removal.
- Remove — Disconnect the wiring harnesses, release the board from its standoffs or mounting clips, and lift it out.
- Install — Seat the new board on the standoffs and reconnect each harness exactly as photographed.
- Test — Restore power, call for cooling, and confirm the LED reports normal operation with no fault codes.
Signs You Need a Replacement
- Compressor won't start despite a valid call for cooling
- Erratic or constant fault-code flashing on the diagnostic LED
- Loss of compressor protection or repeated short cycling
- No response from the board or a visibly burned/corroded 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