ICP Control Board Kit for RHS243L0EA0AAAA — OEM Defrost Board | Ships Today

Overview

This OEM control board kit (part 1183618) fits the ICP RHS243L0EA0AAAA heat pump and is supplied as a complete replacement assembly. The board is the brain of the outdoor unit — it manages the defrost cycle, sequences the compressor and reversing valve, monitors the defrost thermostat, and protects the system with built-in timing and lockout logic. When this board fails, symptoms range from a heat pump that ices over and never defrosts, to no outdoor operation at all, to erratic switching between heating and cooling. Because it ships as a kit, you get the board plus the mounting hardware needed for a clean swap.

Specifications

Compatibility

Designed for the ICP RHS243L0EA0AAAA and used across the ICP family of heat pumps including Tempstar, Heil, and Comfortmaker units that share this control platform. Confirm part number 1183618 on your existing board before ordering.

Installation Guide

1. Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter.
2. Access — Remove the service panel to reach the control box housing the board.
3. Document — Photograph every connector and wire position on the old board before unplugging anything.
4. Remove — Unplug the harnesses, release the standoffs or screws, and lift out the failed board.
5. Install — Mount the new board on the same standoffs and reconnect each harness exactly per your photo.
6. Test — Restore power, run a heating and cooling call, and verify the defrost cycle initiates and terminates correctly.

Signs You Need a Replacement

• Outdoor coil ices over and the unit never goes into defrost.
• No outdoor operation despite a valid thermostat call.
• Erratic or stuck switching between heating and cooling.
• Visible burn marks, blown traces, or a failed relay on the board.

Shipping & Returns

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