Tempstar ComfortAlert Control Board for TXA660GKA100 — Diagnostic Defrost Board | Ships Today
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Overview
This OEM ComfortAlert control board (part number 1177402) is the electronic brain of the Tempstar TXA660GKA100 outdoor unit. It manages compressor operation, monitors current and voltage, and provides on-board diagnostics that flag faults such as low/high pressure trips, locked rotor, short cycling, and welded contactor conditions. The diagnostic LED translates compressor and system faults into flash codes, dramatically reducing troubleshooting time. When this board fails, the unit may not start at all, cycle erratically, ignore the thermostat call, or display no diagnostic feedback. Operating on the 24V control circuit, it protects the compressor — the most expensive component in the system — from damaging fault conditions.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1177402 |
| Type | ComfortAlert Diagnostic Control Board |
| Brand | Tempstar |
| Control Voltage | 24V |
| Function | Compressor Diagnostics & System Control |
| Application | AC / Heat Pump Outdoor Unit |
Compatibility
Direct OEM replacement for the Tempstar TXA660GKA100 condensing unit. This ComfortAlert module is shared across many ICP-family outdoor units (Heil, Comfortmaker, Tempstar) of the same generation. Verify the connector layout and part number against your existing board before installing.
Installation Guide
- Safety First — Disconnect power at the outdoor disconnect and breaker; verify zero voltage with a multimeter.
- Access — Remove the condenser service / control panel to expose the board.
- Document — Photograph every wire harness and terminal connection before disconnecting.
- Remove — Unplug the low-voltage and line connections, then release the board from its standoffs or mounting screws.
- Install — Seat the new board on the mounts and reconnect each harness exactly per your photo.
- Test — Restore power, call for cooling, and confirm normal operation and a healthy diagnostic LED status.
Signs You Need a Replacement
- Outdoor unit won't respond to a thermostat call for cooling
- No diagnostic LED activity or scrambled/constant fault codes
- Compressor short-cycles or trips intermittently with no mechanical cause
- Visible burnt traces, scorched relays, 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