ICP Control Board Kit for RHH048S0BA0AAAA — 24V Heat Pump Defrost Board | Ships Today
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Overview
This genuine OEM control board kit (part number 1183618) is the electronic brain of the ICP/Heil/Tempstar RHH048S0BA0AAAA heat pump. It manages defrost timing and termination, compressor staging, reversing valve switching, and fan operation based on inputs from the thermostat and the outdoor coil sensor. Supplied as a complete kit, it includes the board and the hardware needed for a clean swap. Control boards fail from voltage surges, lightning, corrosion, heat stress, and aged relays. Common symptoms include a heat pump that won't go into or out of defrost, ice buildup on the outdoor coil, no compressor or fan operation, intermittent lockouts, or no response to a thermostat call at all.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1183618 |
| Type | Control Board Kit (Defrost / Sequencing) |
| Brand | ICP (Heil / Tempstar) |
| Control Voltage | 24V |
| Fits Model | RHH048S0BA0AAAA |
Compatibility
Direct OEM replacement kit for the ICP/Heil/Tempstar RHH048S0BA0AAAA heat pump and other units in the same family that use this defrost control platform. Because control boards are revision-specific, verify the part number on your existing board matches 1183618 or its superseding kit before installing.
Installation Guide
- Safety First — Disconnect power at the outdoor disconnect and verify zero voltage with a multimeter before touching the board.
- Access — Remove the condenser electrical service panel to expose the control board.
- Document — Photograph every wire, plug, and sensor connection on the existing board before disconnecting.
- Remove — Unplug the harnesses and sensor leads, release the board standoffs or screws, and lift the old board out.
- Install — Seat the new board on the standoffs, reconnect each harness and sensor exactly per your photo, and set any jumpers/dip switches to match the old board.
- Test — Restore power and run a heating and cooling cycle; verify normal startup, reversing valve action, and a manual or forced defrost cycle.
Signs You Need a Replacement
- Outdoor coil ices over because defrost never initiates or terminates
- No compressor or outdoor fan operation despite a thermostat call
- Intermittent lockouts, error codes, or random shutdowns
- Visible burn marks, corrosion, or a burnt-electronics smell 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