ICP Control Board for WPH4364000RKA1 — OEM Circuit Board | Ships Today
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Overview
This is the genuine OEM control board / circuit board (P/N 1178001) for the ICP/Tempstar/Heil WPH4364000RKA1 packaged heat pump. The control board is the brain of the unit — it manages the operating sequence, processes thermostat inputs, controls compressor and fan timing, sequences defrost on the heat pump, and provides safety interlocks and fault diagnostics. When the board fails, the symptoms can mimic almost any other component: no response to thermostat calls, erratic operation, missing defrost cycles, or blank/blinking diagnostic LEDs. Replacing the board with the correct OEM part restores reliable, code-compliant control of the system.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1178001 |
| Type | Integrated Control / Circuit Board |
| Brand | ICP / Tempstar / Heil |
| Application | Packaged Heat Pump (WPH4364000RKA1) |
| Control Voltage | 24 VAC |
Compatibility
Direct factory replacement for the ICP/Tempstar/Heil WPH4364000RKA1 packaged heat pump and related ICP-family units that originally shipped with control board 1178001. Match the board's part number and connector layout to your existing board before installing.
Installation Guide
- Safety First — Disconnect power at the breaker and disconnect, then verify zero voltage with a multimeter.
- Access — Remove the electrical control-box panel.
- Document — Photograph every connector and wire position on the board before disconnecting anything.
- Remove — Unplug the harness connectors, release the board standoffs/screws, and lift out the old board.
- Install — Mount the new board, reconnect every harness exactly per your photo, and set any jumpers/DIP switches to match.
- Test — Restore power, run a cooling, heating, and defrost call, and confirm normal operation with no fault codes.
Signs You Need a Replacement
- Unit completely unresponsive to thermostat calls.
- Erratic operation, random cycling, or missing defrost.
- Blank or rapidly blinking diagnostic LED / fault codes.
- Visible burn marks, corrosion, or scorched relays on the board.
Shipping & Returns
Ships same day before 3 PM CST. 30-day returns. Backed by the National HVAC Parts fitment guarantee.
Shipping Information
- Orders placed before 3PM CST ship same business day
- Standard delivery: 2-5 business days
- Express shipping available at checkout
- Free shipping on orders over $75
- Tracking number emailed upon shipment
Return Policy
- 30-day returns on unused parts in original packaging
- Electrical parts (capacitors, contactors, control boards) are final sale once installed
- Email info@nationalhvacparts.com to initiate a return
- Refunds processed within 5-7 business days