ICP Control Board for WPH4244000RKA1 — OEM Circuit Board | Ships Today
OEM Guaranteed
Same-Day Ship
30-Day Returns
Secure Checkout
Overview
This is a genuine OEM control circuit board (part #1178001) for the ICP/Tempstar/Heil WPH4244000RKA1 packaged heat pump. The control board is the brain of the unit — it interprets thermostat calls, sequences the compressor, condenser fan, and reversing valve, manages the defrost cycle, and enforces safety lockouts. When the board fails, the symptoms can mimic almost any other component: the unit won't respond to the thermostat, the compressor or fan won't run, the system won't defrost (ice builds on the outdoor coil), or it short-cycles. Common causes are power surges, lightning, moisture intrusion, and failed relays or traces on the board. Look for scorched components, blown onboard fuses, or no LED status/fault flashes.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1178001 |
| Type | Control / Defrost Circuit Board |
| Brand | ICP / Tempstar / Heil |
| Control Voltage | 24V |
| Function | Compressor, Fan, Reversing Valve & Defrost Control |
| Fits Model | WPH4244000RKA1 |
Compatibility
Direct-fit OEM replacement for the ICP WPH4244000RKA1 packaged heat pump and related Tempstar, Heil, and Comfortmaker units originally equipped with control board 1178001. Match the part number and connector layout to your existing board before installing.
Installation Guide
- Safety First — Disconnect power at the breaker and verify zero voltage with a multimeter before touching the board.
- Access — Remove the control-compartment service panel.
- Document — Photograph every harness plug and terminal on the old board before unplugging.
- Remove — Unplug each connector, release the standoffs or screws, and lift out the old board.
- Install — Seat the new board on its standoffs and reconnect each harness to the matching terminal per your photo.
- Test — Restore power, confirm the status LED is normal, and verify heating, cooling, and defrost operation.
Signs You Need a Replacement
- Unit is completely unresponsive to thermostat calls.
- Outdoor coil ices over because the defrost cycle never runs.
- Compressor or fan won't energize despite good contactor and power.
- Visible scorching, blown fuse, or no/abnormal LED fault codes.
Shipping & Returns
Ships same day on orders placed before 3 PM CST. 30-day returns on unused parts. 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