ICP Control Board Kit for RHS243L0BA0AAAA — 24V Defrost Control | Ships Today

Overview

This OEM Control Board Kit (Part No. 1183618) is the electronic brain for the ICP / Tempstar / Heil RHS243L0BA0AAAA heat pump. It manages the defrost cycle, monitors temperature and pressure inputs, and sequences the compressor contactor and reversing valve on a 24V control circuit. When this board fails, the system may run continuously in defrost, fail to switch between heating and cooling, short-cycle the compressor, or stop responding to the thermostat entirely. Replacing the board with a factory kit restores correct timing and protective logic without guesswork.

Specifications

Compatibility

Designed for the ICP RHS243L0BA0AAAA heat pump and shared across the RHS243 platform sold under the ICP, Tempstar, Heil, and Comfortmaker brands. Always confirm your unit's data-plate model and the existing board's part number before ordering.

Installation Guide

1. Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter.
2. Access — Remove the control-panel service cover on the condensing unit.
3. Document — Photograph every wire and connector position on the old board before disconnecting.
4. Remove — Unplug the low-voltage harness and line connections, release the board standoffs, and lift out the failed board.
5. Install — Seat the new board on the standoffs and reconnect every wire exactly per your photos.
6. Test — Restore power, run a heating and a cooling call, and confirm a normal defrost cycle.

Signs You Need a Replacement

• Unit stuck in defrost or never defrosts
• No response to thermostat heat/cool calls
• Compressor short-cycling or failing to start
• Visible scorching, swollen capacitors, or burnt relays on the board

Shipping & Returns

Ships same day before 3 PM CST. 30-day returns. Backed by the National HVAC Parts fitment guarantee.