ICP Control Board Kit for RHH036L0BA0AAAA — Defrost Board | Ships Today

Overview

The ICP 1183618 is a genuine OEM control board kit for the ICP / Heil / Tempstar RHH036L0BA0AAAA heat pump. The board is the brain of the outdoor unit — it manages the defrost cycle, sequences the compressor and reversing valve, energizes the contactor and fan, and enforces safety controls and timing delays. The kit ships with the mounting hardware and any required adapter harness for a clean replacement. A failed board commonly shows as no defrost (ice buildup on the outdoor coil in heating), a unit that won't start despite a good thermostat call, erratic mode switching, or a compressor that runs without proper anti-short-cycle protection.

Specifications

Compatibility

Fits the ICP / Heil / Tempstar RHH036L0BA0AAAA heat pump. Because it is supplied as a kit, it supersedes earlier board revisions for this model family — match the kit number to confirm coverage of your unit.

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.
3. Document — Photograph every connector and wire on the existing board before disconnecting — terminal-by-terminal.
4. Remove — Unplug each harness, release the standoffs or screws, and lift out the old board.
5. Install — Mount the new board on the supplied standoffs and reconnect every harness to the matching terminal per your photo and the kit wiring diagram.
6. Test — Restore power, call for heating and cooling, and verify defrost initiation, mode switching, and normal startup.

Signs You Need a Replacement

• No defrost — ice accumulates on the outdoor coil in heat mode
• Unit won't start despite a valid 24V thermostat call
• Erratic switching between heating and cooling
• Burn marks, scorched traces, or a swollen relay on the board

Shipping & Returns

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