ICP Control Board Kit for RHH048L0CA0AAAA Heat Pump — Defrost/Sequencing Control | Ships Today

Overview

This OEM control board kit (part 1183618) is the electronic brain of the ICP / Heil / Tempstar RHH048L0CA0AAAA 4-ton heat pump. It manages the defrost cycle, compressor sequencing, time-delay relays, and the unit's high/low-pressure and temperature safety circuits. A failed board is one of the most common causes of a heat pump that will not run, will not switch into defrost, or short-cycles. Symptoms include no response to a thermostat call, an iced-over outdoor coil in heating mode, intermittent operation, or a unit that hums but never starts. The kit ships complete so the original board can be swapped one-for-one.

Specifications

Compatibility

Designed for the ICP / Heil / Tempstar RHH048L0CA0AAAA heat pump and compatible RHH048 family condensing units. Always confirm against your unit's rating-plate part number before installing.

Installation Guide

1. Safety First — Disconnect power at the outdoor disconnect and verify zero voltage with a multimeter before touching the board.
2. Access — Remove the control-panel service cover from the condenser.
3. Document — Photograph every wire and connector position on the existing board before disconnecting anything.
4. Remove — Unplug the low-voltage harness and line-voltage leads, release the standoffs/screws, and lift out the old board.
5. Install — Mount the new board on the standoffs and reconnect each wire to match your photos exactly.
6. Test — Restore power, run a heating and a defrost call, and confirm correct sequencing and no fault codes.

Signs You Need a Replacement

• Heat pump does not respond to thermostat calls
• Outdoor coil ices over because defrost never initiates
• Compressor short-cycles or sequencing is erratic
• Visible burnt traces, scorched relays, or a swollen component on the board

Shipping & Returns

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