ICP Control Board for RHS181S0CA0AAAA — OEM Defrost Board Kit | Ships Today

Overview

This is the genuine OEM control board kit (part number 1183618) for the ICP Tempstar Heil RHS181S0CA0AAAA heat pump system. The control board manages the defrost cycle, reversing valve operation, compressor staging, and fan timing for the outdoor unit. A failed board can leave the system unable to heat or cool, prevent it from defrosting in winter, cause short-cycling, or stop it from responding to the thermostat. It runs on a 24V control circuit and ships as a complete replacement kit.

Specifications

Compatibility

Engineered as a direct OEM replacement for the ICP Tempstar Heil RHS181S0CA0AAAA heat pump. Confirm your existing board's part number and connector layout against 1183618 before installing.

Installation Guide

1. Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter.
2. Access — Remove the outdoor unit's control panel cover.
3. Document — Photograph every wire and connector position before disconnecting anything.
4. Remove — Label and unplug each harness, release the board standoffs/screws, and lift out the failed board.
5. Install — Seat the new board on the standoffs and reconnect each harness exactly per your photos.
6. Test — Restore power and verify heating, cooling, and a defrost cycle initiate correctly.

Signs You Need a Replacement

• Unit will not start on a thermostat call for heat or cool
• System fails to run a defrost cycle, icing up the outdoor coil
• Visible burn marks, scorching, or a burnt smell on the board
• Intermittent operation or no response to thermostat

Shipping & Returns

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