Tempstar ComfortAlert Control Board for TXA649GKA100 — Diagnostic Compressor Board | Ships Today
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Overview
This OEM ComfortAlert control board (part number 1177402) is the diagnostic and control module for the Tempstar TXA649GKA100 outdoor unit. It governs compressor operation, monitors line current and voltage, and detects fault conditions including low/high pressure trips, locked rotor, short cycling, missing phase, and welded contactor. An on-board diagnostic LED converts these faults into flash codes so technicians can pinpoint problems quickly. When the board fails, the unit may refuse to start, cycle erratically, ignore the thermostat, or provide no diagnostic feedback. Running on the 24V control circuit, it safeguards the compressor — the costliest component in the system — against damaging operating 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 TXA649GKA100 condensing unit. This ComfortAlert module is shared across many ICP-family outdoor units (Heil, Comfortmaker, Tempstar) of the same generation, including the related TXA660 series. 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 constant/scrambled 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