ICP Fan Coil Control Board for WAHT484A1 — OEM 1172975 | Ships Today

Overview

This is the OEM fan coil control board (part number 1172975) for the ICP WAHT484A1 air handler. The board is the brain of the fan coil unit — it receives 24V thermostat calls, sequences the blower motor, manages auxiliary/electric heat staging, and protects the system through onboard relays and fault logic. When a control board fails, you may see no blower operation, erratic fan behavior, a system that ignores thermostat calls, or no response at all. Burned relay contacts, scorched traces, a blown onboard fuse, or visible heat damage on the board are clear indicators of failure, often triggered by a power surge or a shorted low-voltage circuit.

Specifications

Compatibility

Engineered as a direct OEM fit for the ICP WAHT484A1 air handler and other Tempstar, Heil, and Comfortmaker fan coil units that use part 1172975. Verify the part number printed on your existing board before ordering.

Installation Guide

1. Safety First — Disconnect power at the breaker and verify zero voltage with a multimeter before touching the board.
2. Access — Remove the air handler service panel to reach the control board.
3. Document — Photograph every wire harness and terminal connection before disconnecting; label connectors if needed.
4. Remove — Unplug all harnesses, release the board's mounting standoffs or screws, and lift out the failed board.
5. Install — Seat the new board on its standoffs and reconnect each harness exactly per your photo.
6. Test — Restore power, run a thermostat call, and confirm proper blower and heat staging operation.

Signs You Need a Replacement

• Blower motor will not run or runs erratically
• System ignores thermostat calls for heat or cool
• Visible burn marks, melted relays, or a blown fuse on the board
• No response from the unit despite confirmed 24V and line power

Shipping & Returns

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