ICP Control Board Kit for RHS243H0AA0AAAA — OEM 1183618 Replacement | Ships Today

Overview

This is the OEM Control Board Kit (part number 1183618) for the ICP Tempstar Heil RHS243H0AA0AAAA heat pump. The control board governs defrost timing, compressor and outdoor-fan staging, reversing-valve switching, and safety lockouts for the outdoor unit. A failed board shows up as no-cool/no-heat, ignored thermostat calls, erratic or stuck defrost cycles, and flashing diagnostic fault codes. This factory kit arrives with the correct connector layout for a true plug-in replacement.

Specifications

Compatibility

Engineered for the ICP/Tempstar/Heil RHS243H0AA0AAAA heat pump. Confirm your existing board's number against 1183618 before ordering, as ICP shares chassis families across closely related model suffixes.

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 control-panel access cover.
3. Document — Photograph every wire and connector position before disconnecting anything.
4. Remove — Unplug the wiring harnesses, release the board standoffs/screws, and lift out the old board.
5. Install — Mount the new 1183618 board and reconnect each harness exactly per your photos.
6. Test — Restore power and verify a clean cooling, heating, and defrost cycle with no fault codes.

Signs You Need a Replacement

• Unit will not respond to thermostat calls for heat or cool
• Flashing or solid LED diagnostic fault codes on the board
• Compressor or outdoor fan fails to start or stage correctly
• Stuck, missing, or constantly repeating defrost cycles

Shipping & Returns

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