Tempstar Control Board for T2A336GKD100 — ComfortAlert Diagnostic Module | Ships Today

Overview

This is a genuine OEM Tempstar ComfortAlert control board / diagnostic module (part #1177402) for the Tempstar T2A336GKD100 condensing unit. The ComfortAlert module continuously monitors the compressor's electrical signature and run behavior, then reports faults — such as low voltage, locked rotor, open circuit, welded contactor, or short cycling — through a flashing LED status code. It protects the compressor by detecting abnormal operating conditions early and gives a technician an instant read on what's wrong, dramatically cutting troubleshooting time. When this board fails, the outdoor unit may lose its diagnostic feedback, throw erratic fault codes, fail to start the compressor, or behave unpredictably during a cooling call.

Specifications

Compatibility

This control board is the factory-specified replacement for the Tempstar T2A336GKD100 condensing unit. As an ICP-family component (shared across Tempstar, Heil, Comfortmaker and related brands), it also services comparable single-stage outdoor units that originally used a ComfortAlert diagnostic module. Confirm the OEM part number stamped on your existing board matches 1177402 before installing.

Installation Guide

1. Safety First — Disconnect power at the outdoor disconnect and breaker. Verify zero voltage with a multimeter before working inside the control box.
2. Access — Remove the electrical service panel to expose the control board mounting plate.
3. Document — Photograph all wiring harnesses, terminal positions, and connector orientation before disconnecting anything.
4. Remove — Unplug the low-voltage connectors, release the board's mounting standoffs or screws, and lift out the old module.
5. Install — Seat the new board on its standoffs, reconnect every harness exactly per your photo, and secure it.
6. Test — Restore power and call for cooling. Confirm the compressor starts and the status LED shows a normal run code with no fault flashes.

Signs You Need a Replacement

• No diagnostic LED activity, or a dead/dark status light.
• Erratic or nonsensical fault codes that don't match observed behavior.
• Compressor won't start despite a confirmed 24V cooling call.
• Visible burn marks, corrosion, or scorched traces on the board.

Shipping & Returns

Ships same day on orders placed before 3 PM CST. 30-day returns. Backed by the National HVAC Parts fitment guarantee — if it doesn't fit your model, we'll make it right.