Tempstar Control Board for T2A318GKD100 — ComfortAlert Diagnostic Module | Ships Today
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Overview
This OEM Tempstar Control Board (part 1177402) is a ComfortAlert diagnostic module that continuously monitors the compressor and electrical system on your T2A318GKD100 condensing unit. It tracks voltage, current draw, and compressor run behavior, then flashes coded fault patterns through an onboard LED to pinpoint problems such as locked rotor, open circuit, low voltage, short cycling, and welded contactor conditions. When this board fails, the system may refuse to start, short cycle, run continuously, or throw erratic diagnostic codes. Replacing it with the exact OEM module restores reliable protection and accurate fault reporting.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1177402 |
| Type | ComfortAlert Diagnostic Control Board |
| Brand | Tempstar (ICP / Heil family) |
| Function | Compressor & electrical monitoring |
| Indicator | LED fault code output |
| Fitment | OEM direct replacement |
Compatibility
Engineered as a direct-fit replacement for the Tempstar T2A318GKD100 condensing unit. The same module is shared across many ICP-family outdoor units, including matching Heil, Comfortmaker, and ICP models that originally shipped with part 1177402. Always confirm the printed part number on your existing board before ordering.
Installation Guide
- Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter before touching any wiring.
- Access — Remove the condensing unit service/control panel to expose the board.
- Document — Photograph every wire and connector position before disconnecting anything.
- Remove — Unplug the low-voltage and sensing leads, release the board mounting clips or screws, and lift out the old module.
- Install — Seat the new 1177402 board on its standoffs and reconnect each wire exactly per your photos.
- Test — Restore power, start the system, and confirm normal operation with a steady (no-fault) LED status.
Signs You Need a Replacement
- Continuous or nonsensical LED fault codes with no actual compressor problem
- Compressor will not start or short cycles repeatedly
- No diagnostic LED activity at all when powered
- Visible scorching, swelling, or burnt-smell 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