ICP Control Board Kit for RHS243L0CA0AAAA Heat Pump — OEM Defrost Board | Ships Today
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Overview
This OEM control board kit (part 1183618) is the electronic brain of your ICP / Tempstar / Heil RHS243L0CA0AAAA heat pump. On a heat pump, the defrost control board manages the reversing valve, monitors the outdoor coil temperature, runs the defrost timing logic, and sequences the contactor and fan. When this board fails, the outdoor unit can stop responding to the thermostat, ice over in heating mode, or fail to switch between heating and cooling. The kit ships with the board and the mounting hardware needed for a clean drop-in replacement. Because it is a complete kit rather than a bare board, it includes the harness and standoffs required to land your existing wiring without splicing.
Specifications
| Spec | Value |
|---|---|
| OEM Part Number | 1183618 |
| Type | Control Board Kit (Defrost / Timer) |
| Brand | ICP / Tempstar / Heil |
| Control Voltage | 24V |
| Application | Heat Pump Condensing Unit |
Compatibility
Direct OEM fit for the ICP, Tempstar, Heil, and Comfortmaker RHS243L0CA0AAAA heat pump. The RHS-series defrost board is shared across multiple outdoor models in this family. Verify the original board's part number or connector layout before installing.
Installation Guide
- Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter.
- Access — Remove the condenser service/control panel to reach the board.
- Document — Photograph every connector, plug, and wire color before disconnecting.
- Remove — Unplug each harness connector, release the board from its standoffs or screws, and lift it out.
- Install — Mount the new board on the included hardware and reconnect every harness exactly per your photo.
- Test — Restore power, call for heating and cooling, and verify defrost, reversing-valve switching, and fan operation.
Signs You Need a Replacement
- Outdoor unit does not respond to the thermostat
- Coil ices over in heating mode (defrost not initiating)
- No switching between heating and cooling modes
- Visible burn marks, swollen relays, or scorching 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