ICP Control Board Kit for RHH090L0BA0AAAA — OEM 1183618 Replacement | Ships Today

Overview

The ICP control board kit (OEM part 1183618) is the central electronic brain for the ICP Tempstar Heil RHH090L0BA0AAAA packaged heat pump. It manages defrost timing, blower and compressor sequencing, safety lockouts, and the 24V control circuit that ties the thermostat, contactor, and reversing valve together. When this board fails, the unit may stop responding to the thermostat entirely, lock out on a fault code, run constant or erratic defrost cycles, or fail to switch between heating and cooling. This is a complete factory kit with the correct relays and connectors for a direct OEM replacement.

Specifications

Compatibility

Engineered for the ICP Tempstar Heil RHH090L0BA0AAAA packaged heat pump and shared across related RHH090 platform models that use the same control architecture. Always confirm your existing board part number before ordering.

Installation Guide

1. Safety First — Disconnect power at the unit disconnect and breaker, then verify zero voltage with a multimeter.
2. Access — Remove the control-compartment service panel.
3. Document — Photograph every wire and connector position before disconnecting anything.
4. Remove — Unplug the low-voltage and line-voltage harnesses, release the board standoffs/screws, and lift out the old board.
5. Install — Mount the new board on the standoffs and reconnect each harness exactly per your photos.
6. Test — Restore power and verify heating, cooling, defrost, and blower operation through a full thermostat cycle.

Signs You Need a Replacement

• Unit unresponsive to thermostat or no 24V output
• Repeated fault-code lockouts or flashing diagnostic LED
• Erratic or constant defrost cycling
• Failure to switch between heating and cooling modes

Shipping & Returns

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