ICP Furnace Control Board for WFAR100C042A1 — OEM Ignition Control | Ships Today

Overview

This is a genuine OEM furnace control board (part number 1184783) for the ICP/Tempstar/Heil WFAR100C042A1. The control board is the brain of the furnace: it manages the ignition sequence, sequences the inducer and blower motors, monitors the pressure switch and limit safeties, and validates flame through the sensor. When the board fails you may see no response to a heat call, the furnace stuck on the inducer with no ignition, blower running continuously, or an LED fault code flashing on the board. Replacing a failed board restores proper, safe sequencing of every heating operation.

Specifications

Compatibility

Direct-fit replacement for the ICP/Tempstar/Heil WFAR100C042A1 and other ICP-family furnaces that use this integrated control board. Match the board's part number and connector layout to your original before installing.

Installation Guide

1. Safety First — Disconnect power at the breaker and verify zero voltage with a multimeter.
2. Access — Remove the blower/control compartment door.
3. Document — Photograph every connector and wire location before disconnecting.
4. Remove — Unplug all harnesses, remove the board mounting screws or standoffs, and lift out the old board.
5. Install — Mount the new board, reconnect each harness exactly per your photo, and set any DIP switches to match the original.
6. Test — Restore power and run a full heat cycle, confirming proper ignition, blower, and shutdown sequencing.

Signs You Need a Replacement

• No response to a thermostat call for heat
• Inducer runs but no ignition sequence begins
• Blower runs continuously or won't start
• Fault LED flashing or visible burn marks/relay damage on the board

Shipping & Returns

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