ICP Control Board Kit for RHS181S0AA0AAAA – OEM Defrost/Control Board | Ships Today

Overview

This OEM control board kit (OEM 1183618, KIT CONTROL BOARD) is the brains of the ICP RHS181S0AA0AAAA heat pump. The board manages the defrost cycle, sequences the compressor and reversing valve, monitors safeties, and routes 24V control signals between the thermostat and the unit's components. A failed board commonly shows up as a heat pump that won't start, won't enter or exit defrost, ices over in cold weather, or behaves erratically despite a good thermostat and contactor. This complete kit replaces the original board with a factory-matched assembly for proper sequencing and reliable cold-weather operation.

Specifications

Compatibility

Designed for the ICP heat pump model RHS181S0AA0AAAA and shared platforms under the Tempstar, Heil, and Comfortmaker brands. Match OEM part number 1183618 and the existing board's connector layout before ordering.

Installation Guide

1. Safety First – Disconnect all power and verify zero voltage with a multimeter before handling the board.
2. Access – Remove the service/control panel to expose the existing control board.
3. Document – Photograph every plug, terminal, and jumper/dip-switch setting on the old board.
4. Remove – Unplug each harness, note dip-switch positions, and unscrew or unclip the board from its standoffs.
5. Install – Mount the new board, set dip switches to match the original, and reconnect each harness per your photo.
6. Test – Restore power, call for heating and cooling, and confirm normal startup and a forced/automatic defrost cycle.

Signs You Need a Replacement

• Heat pump completely unresponsive to the thermostat despite power.
• Outdoor coil ices over because defrost never initiates.
• No 24V output to the contactor or reversing valve from the board.
• Visible burnt traces, scorched relays, or blown components on the old board.

Shipping & Returns

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