ICP Control Board Kit for RHS181L0AA0AAAA — Integrated Heat Pump Control | Ships Today

Overview

The 1183618 Control Board Kit is the genuine OEM electronic control for the ICP/Tempstar/Heil RHS181L0AA0AAAA heat pump. This board governs compressor staging, defrost timing, reversing-valve switching, fan operation, and safety lockouts — it is effectively the brain of the condensing unit. A failed board shows up as a dead unit, erratic or stuck defrost cycles, a condenser fan that runs nonstop or never starts, or flashing diagnostic fault codes. Installing the exact OEM board kit restores correct sequencing and protects the compressor from damaging short cycles. The kit arrives complete with the mounting hardware and connector pigtails for a direct swap.

Specifications

Compatibility

Engineered for the ICP/Tempstar/Heil RHS181L0AA0AAAA heat pump and closely related RHS181 series units across the International Comfort Products brand family. Verify your existing board reads 1183618 before installing.

Installation Guide

1. Safety First — Disconnect power at the breaker and the unit disconnect; verify zero voltage with a multimeter.
2. Access — Remove the control-panel service cover.
3. Document — Photograph every wire and connector landing before disconnecting.
4. Remove — Unplug the harness connectors, release the board standoffs, and lift the old board out.
5. Install — Mount the new board on the standoffs and reconnect each harness exactly per your photo.
6. Test — Restore power, run a heat and cool call, and confirm defrost, fan, and compressor sequencing.

Signs You Need a Replacement

• Unit completely dead with 24V present at the transformer
• Defrost cycle stuck on or never engaging in heat mode
• Flashing fault/diagnostic LED on the board
• Compressor or fan short-cycling or failing to energize

Shipping & Returns

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