Tempstar Control Board for T4A360GKN300 – ComfortAlert Diagnostic | Ships Today
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Overview
This is a genuine OEM ComfortAlert control board (part number 1177402) for the Tempstar T4A360GKN300 condensing unit. The ComfortAlert module is a diagnostic and protection board that monitors the compressor and the 24V control circuit, flashing fault codes through an onboard LED to help technicians pinpoint problems such as locked-rotor, open-circuit, low-voltage, short-cycling, and welded-contactor conditions. It also provides anti-short-cycle protection that prevents the compressor from restarting too quickly after a shutdown. When this board fails, the outdoor unit may refuse to start, short-cycle, lose its diagnostic LED, or trip protective lockouts even when the compressor itself is healthy. Replacing a faulty ComfortAlert board restores both protection and on-unit troubleshooting.
Specifications
| Spec | Value |
|---|---|
| OEM Part Number | 1177402 |
| Type | ComfortAlert Diagnostic / Protection Board |
| Brand | Tempstar |
| Control Voltage | 24 VAC |
| Functions | Compressor monitoring, fault codes, anti-short-cycle |
| Fits Model | T4A360GKN300 |
Compatibility
This control board is the factory-specified replacement for the Tempstar T4A360GKN300 and other ICP-family (Tempstar, Heil, Comfortmaker) condensing units that use OEM part 1177402. Match the 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.
- Access – Remove the condenser control panel to expose the board.
- Document – Photograph every low-voltage and sensor connection before unplugging.
- Remove – Unplug the connectors, release the mounting standoffs, and lift out the old board.
- Install – Snap the new board onto the standoffs and reconnect each plug exactly as photographed.
- Test – Restore power, confirm the LED illuminates, and verify normal compressor operation with no fault codes.
Signs You Need a Replacement
- Diagnostic LED is dark or stuck flashing a constant fault.
- Compressor short-cycles or locks out for no mechanical reason.
- Outdoor unit will not start despite a valid cooling call.
- Erratic or false fault codes after a power event or storm.
Shipping & Returns
Ships same day before 3 PM CST. 30-day returns. 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