ICP Control Board Kit for RHS243S0EA0AAAA — OEM Defrost Control | Ships Today
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Overview
This OEM control board kit (part 1183618) is the electronic brain of your ICP RHS243S0EA0AAAA heat pump. It manages defrost timing, compressor staging, reversing-valve switching, and anti-short-cycle protection, coordinating the 24V control circuit that drives the contactors and relays. The kit ships with the mounting hardware and connectors needed for a complete replacement. A failed board typically shows up as a heat pump that won't enter or exit defrost, ices over in heating mode, refuses to switch between heating and cooling, or simply stops responding to thermostat calls even though 24V power is present.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1183618 |
| Type | Control board kit (defrost / timing control) |
| Brand | ICP (Tempstar / Heil / Comfortmaker family) |
| Control Voltage | 24V |
| Includes | Board, mounting hardware, connectors |
Compatibility
Engineered as a direct-fit kit for the ICP RHS243S0EA0AAAA heat pump and equivalent ICP-built outdoor units sold under Tempstar, Heil, Comfortmaker, Arcoaire, and KeepRite. Because it ships as a kit, it supersedes several earlier board revisions — match the part number and connector layout to your existing board before installing.
Installation Guide
- Safety First — Disconnect power at the unit and breaker, then verify zero voltage with a multimeter.
- Access — Remove the service panel to expose the control board.
- Document — Photograph every wire harness and plug location before disconnecting.
- Remove — Unplug the harnesses, release the board standoffs, and lift the old board out.
- Install — Seat the new board on the supplied standoffs and reconnect each harness to its matching header per your photo.
- Test — Restore power, run a cooling and a heating call, and confirm proper defrost and reversing-valve operation.
Signs You Need a Replacement
- Heat pump ices over and never initiates defrost
- Will not switch between heating and cooling modes
- No response to thermostat calls despite 24V at the board
- Visible scorch marks, burnt relays, or swollen components 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