ICP Control Board for WPA3484000RKC1 – Defrost Circuit Board | Ships Today
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Overview
This OEM circuit control board (OEM 1178001) is the electronic brain of the ICP / Heil / Tempstar WPA3484000RKC1 heat pump. It manages the defrost cycle, compressor and fan timing, reversing-valve sequencing, and safety lockouts, coordinating the low-voltage signals from the thermostat with the high-voltage switching of the contactor. When a control board fails, the unit can stop running entirely, get stuck in defrost, ice up in heating mode, short-cycle, or ignore thermostat calls altogether. Burnt traces, scorched relays, swollen components, or a board that no longer energizes the contactor are clear failure signs, often caused by power surges, moisture intrusion, or a shorted control component. Replacing the board with this OEM unit restores proper defrost logic and reliable heat-pump operation.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1178001 |
| Type | Defrost / Sequencing Control Board |
| Brand | ICP / Heil / Tempstar |
| Function | Defrost, timing, and reversing-valve control |
| Control Voltage | 24V |
Compatibility
Direct OEM fit for the ICP / Heil / Tempstar WPA3484000RKC1 heat pump condensing unit. Used across ICP-family heat pumps that rely on this defrost control board for compressor and reversing-valve sequencing.
Installation Guide
- Safety First – Disconnect power at the breaker and the outdoor disconnect. Verify zero voltage with a multimeter.
- Access – Remove the control-panel service cover to reach the board.
- Document – Photograph every wire harness, plug, and terminal position on the board before disconnecting.
- Remove – Unplug each connector, release the board standoffs or screws, and lift out the failed board.
- Install – Seat the new board on the standoffs and reconnect every harness and terminal exactly per your photo.
- Test – Restore power and confirm the unit starts, runs, and completes a normal defrost cycle without faults.
Signs You Need a Replacement
- Unit won't start or ignores thermostat calls
- Stuck in defrost or icing up in heat mode
- Short-cycling or erratic compressor and fan operation
- Visible burnt traces, scorched relays, or swollen components
Shipping & Returns
Ships same day on orders placed before 3 PM CST. 30-day hassle-free 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