ICP Control Board for RHH048H0CA0AAAA — Heat Pump Defrost Control Kit | Ships Today
OEM Guaranteed
Same-Day Ship
30-Day Returns
Secure Checkout
Overview
The ICP control board kit (OEM #1183618) is the brain of your RHH048H0CA0AAAA heat pump. It manages the defrost cycle, reversing-valve switching, compressor staging, and 24V control signaling between the thermostat, contactor, and outdoor fan. When this board fails, the unit may stop heating or cooling, run a continuous defrost, fail to switch between heat and cool, or simply go dead with no response at the thermostat. This is a complete factory kit supplied with the mounting hardware and wiring diagram needed for a direct, code-compliant replacement.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1183618 |
| Type | Control / Defrost Board Kit |
| Brand | ICP (Tempstar / Heil / Comfortmaker) |
| Control Voltage | 24V |
| Application | Heat Pump |
| Fit | OEM Direct Replacement |
Compatibility
Engineered for the ICP/Tempstar/Heil RHH048H0CA0AAAA heat pump and shared platform models that originally used board #1183618. Always match your existing part number before ordering.
Installation Guide
- Safety First — Disconnect power at the breaker and verify zero voltage with a multimeter.
- Access — Remove the control-panel service cover.
- Document — Photograph every wire and connector on the existing board before disconnecting.
- Remove — Unplug the wiring harnesses, release the standoffs/screws, and lift out the old board.
- Install — Mount the new board on the standoffs and reconnect each harness exactly per your photo.
- Test — Restore power and verify heat, cool, and defrost operation through a full call.
Signs You Need a Replacement
- Unit completely unresponsive to thermostat calls
- Heat pump stuck in defrost or won't defrost at all
- Won't switch between heating and cooling modes
- Visible scorching, burnt traces, or failed relays 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