ICP Control Board for WPH4304000RKA1 — OEM Circuit Board | Ships Today

Overview

This OEM circuit control board (part number 1178001) is the electronic brain of your ICP/Tempstar/Heil WPH4304000RKA1 heat pump. It manages compressor and fan timing, sequences the defrost cycle in heat-pump mode, switches the reversing valve, and protects the system through built-in time delays and safety lockouts. When the board fails, the symptoms range from a unit that won't start at all to erratic behavior — short cycling, missed defrost cycles with ice buildup on the outdoor coil, or the fan and compressor running out of sequence. Heat and power surges are the usual culprits, often leaving visible burn marks or scorched relays on the board.

Specifications

Compatibility

Direct OEM fit for the ICP/Tempstar/Heil WPH4304000RKA1 heat pump. Match the part number and connector layout to your existing board before installing, as control boards are model-specific.

Installation Guide

1. Safety First — Disconnect power at the breaker and verify zero voltage with a multimeter before handling the board.
2. Access — Remove the control panel cover on the outdoor unit.
3. Document — Photograph every connector and wire position on the board before unplugging anything.
4. Remove — Unplug the harnesses, release the standoffs or screws, and lift out the old board.
5. Install — Mount the new board, set any jumpers/DIP switches to match the original, and reconnect each harness per your photo.
6. Test — Restore power and confirm proper startup, defrost, and reversing-valve operation.

Signs You Need a Replacement

• Outdoor unit completely unresponsive with control voltage present
• No defrost cycle — ice builds up on the outdoor coil
• Compressor and fan short cycle or run out of sequence
• Visible burn marks, melted 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.