ICP Control Board Kit for RHH090S0BA0AAAA — OEM Defrost Board | Ships Today
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Overview
This is the genuine OEM control board kit (part number 1183618) for the ICP/Tempstar/Heil RHH090S0BA0AAAA heat pump. The control board is the brain of the outdoor unit — it manages the defrost cycle, sequences the compressor and reversing valve, switches the condenser fan, and coordinates the 24V signals between the thermostat, contactor, and accessories. Supplied as a complete kit, it includes the board and the mounting hardware needed for a direct replacement. When a control board fails, the symptoms are often intermittent and confusing: the unit may run constantly in defrost, never defrost and ice over, fail to switch between heating and cooling, or stop responding to thermostat calls entirely. Replacing the board with the correct OEM kit restores proper sequencing and protects the compressor from short-cycling.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1183618 |
| Type | Control Board Kit (Defrost/Control) |
| Brand | ICP (Tempstar / Heil) |
| Control Voltage | 24V |
| Includes | Board + Mounting Hardware |
| Fitment | OEM Replacement |
Compatibility
Direct-fit OEM replacement for the ICP/Tempstar/Heil RHH090S0BA0AAAA and the related RHH090S0AA0AAAA heat pump models, plus other ICP-family outdoor units that originally used the 1183618 control board kit. Verify the original board part number against the unit's wiring diagram or rating plate before ordering.
Installation Guide
- Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter before touching the board.
- Access — Remove the condenser control-panel cover to expose the board.
- Document — Photograph every connector and wire position; note the defrost timer pin setting if applicable.
- Remove — Unplug the harness connectors, release the board standoffs/screws, and lift out the old board.
- Install — Mount the new board, transfer the defrost timing setting, and reconnect every harness exactly per your photos.
- Test — Restore power, run a heating and cooling call, and confirm correct compressor, fan, reversing valve, and defrost operation.
Signs You Need a Replacement
- Heat pump stuck in or never entering defrost; outdoor coil icing over.
- Unit ignores thermostat calls or short-cycles the compressor.
- Reversing valve fails to switch between heating and cooling.
- Visible burn marks, corrosion, or failed relays on the board.
Shipping & Returns
Ships same day before 3 PM CST. 30-day returns. 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