ICP Control Board Kit for RGS303LDAA0AAAA — OEM Replacement | Ships Today

Overview

This genuine OEM control board kit (part number 1183618) is the integrated control center for the ICP/Tempstar/Heil model RGS303LDAA0AAAA. The board manages the ignition sequence, blower timing, safety lockouts, and communication between the thermostat, igniter, gas valve, and motors. When the board fails, the entire unit can go dead or behave erratically. Common failure symptoms include no response to a thermostat call, blower or igniter that won't energize, repeated lockouts, error codes flashing on the diagnostic LED, or visible burn marks and blown traces on the board.

Specifications

Compatibility

Direct-fit replacement kit for ICP model RGS303LDAA0AAAA and equivalent Tempstar, Heil, and Comfortmaker equipment that uses the 1183618 control board. Match the board's connector layout and part number to your existing control before installing.

Installation Guide

1. Safety First — Disconnect power at the breaker and disconnect switch, then verify zero voltage with a multimeter.
2. Access — Remove the control/blower compartment service panel.
3. Document — Photograph every wire harness and connector position before disconnecting.
4. Remove — Unplug all connectors and remove the board's mounting screws or standoffs.
5. Install — Mount the new board and reconnect each harness to the matching terminal per your photo.
6. Test — Restore power and confirm the unit runs through a full heating cycle with no fault codes.

Signs You Need a Replacement

• Unit is completely unresponsive to thermostat calls.
• Igniter, blower, or inducer fails to energize in sequence.
• Repeated lockouts or diagnostic error codes on the board LED.
• Visible burn marks, corrosion, or blown traces on the board.

Shipping & Returns

Ships same day before 3 PM CST. 30-day returns. Backed by the National HVAC Parts fitment guarantee.