ICP Control Board Kit for RHH120L0AA0AAAA — Heat Pump | Ships Today

Overview

This OEM control board kit (part 1183618) is the electronic brain for the ICP / Heil / Tempstar heat pump model RHH120L0AA0AAAA. It manages the unit's sequence of operation — energizing the contactor and reversing valve, timing the compressor, and on a heat pump running the defrost cycle that clears frost from the outdoor coil in cold weather. When the board fails, the system may not respond to thermostat calls, skip defrost (coil ices over), short-cycle, or throw fault codes on the diagnostic LED. The kit ships with mounting hardware for a direct replacement.

Specifications

Compatibility

Built for ICP-family heat pump model RHH120L0AA0AAAA and shared-platform Heil, Tempstar, and Comfortmaker units that use the 1183618 board. Match the board's part number and connector layout to your existing board before installing.

Installation Guide

1. Safety First — Disconnect power at the disconnect and breaker; verify zero voltage with a multimeter.
2. Access — Remove the control/electrical panel to expose the board.
3. Document — Photograph every wire harness and terminal position before unplugging.
4. Remove — Unplug the harnesses, release the standoffs/screws, and lift out the old board.
5. Install — Seat the new board on its mounts and reconnect each harness to the matching terminal per your photo.
6. Test — Restore power, run heat and cool calls, and confirm normal operation and a clear diagnostic LED.

Signs You Need a Replacement

• Unit unresponsive to thermostat calls
• Outdoor coil ices over (defrost not running)
• Short-cycling or erratic operation
• Fault codes or no light on the board's diagnostic LED

Shipping & Returns

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