ICP Defrost Control Board Kit for RHS240H0CA0AAAA — 24V | Ships Today

Overview

This genuine OEM control board kit (part 1183618) is the electronic brain of the ICP / Heil / Tempstar RHS240H0CA0AAAA heat pump. The board manages the defrost cycle, sequences the compressor and condenser fan, switches the reversing valve between heating and cooling, and coordinates the 24V control signals coming from the thermostat. When this board fails, the entire outdoor unit can become unpredictable — the system may stop heating or cooling, get stuck in or never enter defrost, allow the coil to ice over, or short-cycle the compressor. The kit ships with the mounting hardware and connectors needed for a clean swap.

Specifications

Compatibility

Direct OEM replacement for the ICP RHS240H0CA0AAAA and the related Heil, Tempstar, and Comfortmaker heat pumps that share this platform. Confirm the original board part number before ordering, as defrost boards are model-specific.

Installation Guide

1. Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter.
2. Access — Remove the control-box service panel.
3. Document — Photograph every wire and connector position before disconnecting.
4. Remove — Unplug the harnesses, release the standoffs or screws, and lift out the old board.
5. Install — Seat the new board on its standoffs and reconnect each harness exactly per your photo.
6. Test — Restore power and verify heating, cooling, and a manual or timed defrost cycle.

Signs You Need a Replacement

• Unit won't switch between heating and cooling
• Outdoor coil ices over (defrost not running)
• Compressor or fan short-cycles erratically
• No response to thermostat calls despite good 24V power

Shipping & Returns

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