ICP Control Board Kit for RHH120S0AA0AAAA — OEM 1183618 Heat Pump Board | Ships Today
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Overview
The ICP OEM Control Board Kit (part number 1183618) is the factory-engineered control module for the ICP / Tempstar / Heil RHH120S0AA0AAAA heat pump. The control board is the brain of the system — it manages the defrost cycle, sequences the compressor and reversing valve, monitors safety inputs, and coordinates communication between the thermostat and outdoor unit. A failed board is one of the most common causes of a heat pump that won't run, won't defrost, or short-cycles. Replacing it with the exact OEM kit restores reliable operation without the guesswork of universal aftermarket boards. Typical failure symptoms include a completely dead outdoor unit, ice buildup from missed defrost cycles, intermittent operation, error codes at the thermostat, and burnt or scorched traces on the old board.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1183618 |
| Type | Control Board Kit |
| Brand | ICP (Tempstar / Heil) |
| Control Voltage | 24V |
| Application | Heat Pump Outdoor Unit |
| Fitment | OEM Direct Replacement |
Compatibility
Engineered as a direct-fit replacement for the ICP RHH120S0AA0AAAA heat pump and shared chassis units sold under the Tempstar, Heil, and Comfortmaker labels. Always verify the part number printed on your existing board matches 1183618 before installing.
Installation Guide
- Safety First — Disconnect power at the outdoor disconnect and breaker, then verify zero voltage with a multimeter.
- Access — Remove the outdoor unit's control/service panel.
- Document — Photograph every wire and connector position before disconnecting.
- Remove — Unplug all harness connectors and remove the mounting screws/standoffs holding the old board.
- Install — Mount the new board on the standoffs and reconnect each harness exactly per your photos.
- Test — Restore power and verify the unit runs in both heating and cooling, including a defrost cycle.
Signs You Need a Replacement
- Outdoor unit is completely unresponsive
- Heat pump ices over from skipped defrost cycles
- Intermittent or short-cycling operation
- Visible burn marks, swollen capacitors, or cracked traces on the board
Shipping & Returns
Ships same day on orders placed 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