ICP Control Board Kit for RHH048L0BA0AAAA — OEM Defrost Board | Ships Today

Overview

This genuine OEM control board kit (part #1183618) is the electronic brain of the ICP RHH048L0BA0AAAA heat pump. It manages the defrost cycle, compressor and fan sequencing, time delays, and safety lockouts based on inputs from the thermostat and sensors. The kit ships with the board and the mounting hardware/instructions needed for a clean replacement. A failed board shows up as no-defrost icing, a unit that won't respond to thermostat calls, erratic cycling, or blank diagnostic LEDs. Because it controls so many functions, the board is a high-value repair that restores full heat-pump operation.

Specifications

Compatibility

Designed for the ICP/Tempstar/Heil RHH048L0BA0AAAA heat pump and related ICP-family models calling out board kit 1183618. Confirm the part number on your existing board before ordering.

Installation Guide

1. Safety First — Disconnect power and verify zero voltage with a multimeter.
2. Access — Remove the service panel to reach the control board.
3. Document — Photo every connector, harness, and terminal before disconnecting.
4. Remove — Unplug harnesses, remove the mounting screws/standoffs, and lift out the old board.
5. Install — Mount the new board, transfer connectors exactly per your photo, and set any jumpers/dip switches to match.
6. Test — Restore power, run a heat and cool call, and verify defrost and sequencing operate normally.

Signs You Need a Replacement

• Outdoor coil ices over with no defrost cycle
• Unit won't respond to thermostat calls
• Erratic short-cycling or random shutdowns
• No diagnostic LED activity or burnt spots on the board

Shipping & Returns

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