ICP Control Board for WPA4424000RKB1 — OEM Circuit Board | Ships Today
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Overview
This is a genuine OEM control circuit board (part number 1178001) for the ICP/Tempstar/Heil model WPA4424000RKB1. The control board is the brain of the outdoor unit — it takes the 24V signal from the thermostat, manages the contactor and fan timing, runs anti-short-cycle and time-delay logic, and on heat-pump units coordinates defrost and reversing-valve operation. Because it is packed with relays, capacitors, and solid-state components, it is vulnerable to power surges, lightning, voltage spikes, and simple age-related failure. A bad board produces frustrating, intermittent symptoms: the unit ignores the thermostat, short-cycles, will not stage properly, or behaves erratically with no obvious mechanical fault. Replacing the board with the exact OEM part restores correct, reliable sequencing.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1178001 |
| Type | Control / Circuit Board |
| Brand | ICP / Tempstar / Heil |
| Control Voltage | 24V |
| Fits Model | WPA4424000RKB1 |
Compatibility
Designed for the ICP, Tempstar, Heil, and Comfortmaker unit WPA4424000RKB1, and a direct OEM replacement for part 1178001. Match the board's part number and connector layout to your existing board before installing, as control boards are model-specific.
Installation Guide
- Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter.
- Access — Remove the electrical-compartment service panel.
- Document — Photograph every plug, harness, and terminal on the board before disconnecting.
- Remove — Unplug the connectors, release the standoffs or screws, and lift out the failed board.
- Install — Mount the new board on the standoffs and reconnect each harness to its matching terminal per your photo.
- Test — Restore power, call for cooling/heating, and confirm correct contactor, fan, and (if applicable) defrost sequencing.
Signs You Need a Replacement
- Unit does not respond to the thermostat despite good 24V power.
- Intermittent or erratic operation with no mechanical cause.
- Short-cycling or failure to honor time-delay logic.
- Visible burn marks, scorched traces, or a blown relay 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