Tempstar Control Board for T4A330GKN300 — ComfortAlert Compressor Diagnostics | Ships Today
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Overview
This OEM ComfortAlert control board (part number 1177402) is the diagnostic module that monitors and protects the compressor in your Tempstar T4A330GKN300 air conditioner. It continuously watches compressor and contactor operation, flashing fault codes via an onboard LED to identify issues such as long run cycles, low voltage, locked rotor, open circuit, and missing run capacitor — saving technicians significant diagnostic time. When this board fails, you may see the compressor failing to start, no fault codes when there should be, repeated nuisance lockouts, or a unit that ignores cooling calls entirely. Replacing the diagnostic board restores both compressor protection and clear troubleshooting feedback.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1177402 |
| Type | ComfortAlert Compressor Diagnostic Control Board |
| Brand | Tempstar |
| Function | Compressor monitoring, fault-code diagnostics, protection |
| Control Voltage | 24V |
| Fits Model | T4A330GKN300 |
Compatibility
Direct OEM replacement for the Tempstar T4A330GKN300 condensing unit. The same ComfortAlert diagnostic module is shared across many ICP/Heil/Tempstar/Comfortmaker single-stage air conditioners and heat pumps. Verify the existing module is a ComfortAlert diagnostic board before installing.
Installation Guide
- Safety First — Disconnect power at the outdoor disconnect and breaker, then verify zero voltage with a multimeter.
- Access — Remove the condenser control-box service panel.
- Document — Photograph all low-voltage and sensing wire connections before disconnecting.
- Remove — Unplug the wiring harness and unscrew or unclip the old board from its standoffs.
- Install — Mount the new board on the standoffs and reconnect each connection exactly per your photo.
- Test — Restore power, initiate a cooling call, and confirm the compressor runs and the LED reports normal status.
Signs You Need a Replacement
- Compressor will not start despite a valid cooling call
- No diagnostic LED activity or stuck/erratic fault codes
- Repeated nuisance lockouts with no underlying fault
- Loss of compressor protection or inconsistent operation
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