ICP Furnace Control Board for RGS120LECB0AAA — OEM Kit 1183618 | Ships Today

Overview

OEM control board kit 1183618 is the integrated furnace control (IFC) brain for the ICP/Heil/Tempstar RGS120LECB0AAA gas furnace. It manages the ignition sequence, blower and inducer timing, safety lockouts, and the 24V control circuit between the thermostat, gas valve, igniter, and limit switches. A failed board typically shows as a furnace that won't respond to the thermostat, won't run the inducer or blower, or that flashes a diagnostic fault code from its onboard LED.

Specifications

Compatibility

Built for the ICP-family RGS120LECB0AAA furnace and equivalent Heil, Tempstar, and Comfortmaker units. The kit includes the board and mounting hardware needed for a direct swap. Verify your model and serial against part 1183618 before ordering.

Installation Guide

1. Safety First — Disconnect power at the furnace switch and breaker, and verify zero voltage with a multimeter.
2. Access — Remove the furnace control compartment panel.
3. Document — Photograph every wire and connector position before disconnecting anything.
4. Remove — Label and unplug the connectors, remove the mounting screws, and lift out the old board.
5. Install — Mount the new board, transfer each connector to its matching terminal per your photo, and set any DIP switches/jumpers to match the original.
6. Test — Restore power, run a full heat cycle, and confirm proper ignition, inducer, and blower timing with no fault codes.

Signs You Need a Replacement

• Furnace completely unresponsive to the thermostat.
• Inducer or blower motor never energizes on a heat call.
• Persistent diagnostic LED fault code pointing to the control.
• Burnt traces, scorched relays, or a burnt smell on the board.

Shipping & Returns

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