ICP Control Board for WPA3424000RKC1 — Defrost Circuit Board | Ships Today

Overview

This OEM circuit board (part 1178001) is the brain of the ICP / Tempstar / Heil WPA3424000RKC1 heat pump. It manages the defrost cycle, sequences the compressor contactor and reversing valve, monitors the defrost thermostat, and protects the system with built-in timing delays. When the board fails the unit may stop heating, ice over in heat-pump mode, short-cycle, or fail to start the compressor entirely. A board with burnt traces, a cracked relay, or no output to the contactor is a classic failure. Replacing it restores correct defrost timing and reliable compressor control.

Specifications

Compatibility

Direct-fit replacement for the ICP / Tempstar / Heil / Comfortmaker WPA3424000RKC1 condenser. This board is shared across many ICP-family heat-pump outdoor units; verify the existing part number 1178001 before ordering.

Installation Guide

1. Safety First — Disconnect power at the breaker and outdoor disconnect, then verify zero voltage with a multimeter.
2. Access — Remove the control-panel service cover on the condenser.
3. Document — Photograph the full wiring harness and every plug location before disconnecting.
4. Remove — Unplug the low-voltage connectors and high-voltage leads, then unscrew the old board from its standoffs.
5. Install — Mount the new board, then reconnect each connector and lead exactly per your photo.
6. Test — Restore power, confirm the contactor energizes, and force a defrost cycle to verify operation.

Signs You Need a Replacement

• Outdoor coil ices over and never defrosts
• Compressor will not start or short-cycles
• Visible burnt traces, swollen capacitors, or cracked relay on the board
• No 24V output to the contactor coil despite a thermostat call

Shipping & Returns

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