ICP Control Board Kit for RHX048K0XA0AAA — Heat Pump Defrost Board | Ships Today
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Overview
This OEM control board kit (part number 1183618) is the electronic brain of the ICP RHX048K0XA0AAA heat pump. Operating on the 24-volt control circuit, the board manages defrost timing and termination, energizes the reversing valve and contactor, sequences the outdoor fan, and provides safety lockouts that protect the compressor from short-cycling and pressure faults. Supplied as a complete kit with the mounting hardware and connector harness needed for a clean swap, it restores reliable heat-pump operation when the original board has failed. Common failure symptoms include no outdoor unit operation, the system stuck in or out of defrost, ice buildup on the coil in heating mode, a fan that runs constantly or not at all, and erratic switching between heating and cooling. Board failures are frequently caused by power surges, lightning, moisture intrusion, and overheated relays.
Specifications
| Spec | Value |
|---|---|
| OEM Part Number | 1183618 |
| Type | Defrost / Timing Control Board Kit |
| Brand | ICP / Tempstar / Heil / Comfortmaker |
| Control Voltage | 24V |
| Includes | Board, mounting hardware, connectors |
| Application | Heat Pump Outdoor Unit |
Compatibility
A direct OEM replacement kit for the ICP RHX048K0XA0AAA heat pump and the matching Tempstar, Heil, and Comfortmaker outdoor units that use this defrost control platform. Verify the part number on the existing board before ordering.
Installation Guide
- Safety First — Disconnect power at the outdoor disconnect and breaker, then verify zero voltage with a multimeter.
- Access — Remove the condenser unit's electrical control panel.
- Document — Photograph every wire and connector on the old board before removing anything.
- Remove — Unplug the harness connectors, remove the mounting screws or standoffs, and lift out the failed board.
- Install — Mount the new board with the supplied hardware and reconnect each plug to match your photo.
- Test — Restore power, run a heating and a cooling cycle, and confirm proper defrost and reversing-valve operation.
Signs You Need a Replacement
- Outdoor unit is completely unresponsive on a call for heat or cool.
- Heavy ice or frost on the outdoor coil because defrost never initiates.
- System stuck in defrost or constantly switching modes.
- Burnt smell, scorched relays, or visible damage on the board.
Shipping & Returns
Ships same day before 3 PM CST. 30-day returns. Backed by the National HVAC Parts fitment guarantee.
Shipping Information
- Orders placed before 3PM CST ship same business day
- Standard delivery: 2-5 business days
- Express shipping available at checkout
- Free shipping on orders over $75
- Tracking number emailed upon shipment
Return Policy
- 30-day returns on unused parts in original packaging
- Electrical parts (capacitors, contactors, control boards) are final sale once installed
- Email info@nationalhvacparts.com to initiate a return
- Refunds processed within 5-7 business days