ICP Furnace Control Board Kit for RHH120H0CA0AAAA — 24V Defrost Board | Ships Today
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Overview
This is the OEM control board kit (part number 1183618) for the ICP Tempstar Heil RHH120H0CA0AAAA heat pump. The control board is the brain of the outdoor unit, managing the defrost cycle, reversing valve timing, compressor contactor signaling, and 24V low-voltage logic between the thermostat and the system. When this board fails, the unit may stop heating or cooling, get stuck in or out of defrost, short-cycle the compressor, or go completely unresponsive. A failed control board commonly shows blank diagnostics, blown fuses, or relays that won't energize. Replacing it with the correct OEM kit restores factory defrost timing and protection logic.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1183618 |
| Type | Control Board Kit (Defrost / Integrated) |
| Brand | ICP (Tempstar / Heil) |
| Control Voltage | 24V |
| Application | Heat Pump Outdoor Unit |
| Fits Model | RHH120H0CA0AAAA |
Compatibility
Direct OEM fit for the ICP RHH120H0CA0AAAA heat pump. The RHH platform is shared across ICP's Tempstar, Heil, Comfortmaker, and related family brands, so this kit also services equivalent units built on the same chassis. Always verify your existing board part number against 1183618 before installing.
Installation Guide
- Safety First — Disconnect power at the outdoor disconnect and verify zero voltage with a multimeter.
- Access — Remove the control panel access cover on the condensing unit.
- Document — Photograph all wire positions and terminal labels before disconnecting anything.
- Remove — Label and disconnect each connector, release the board standoffs/screws, and lift the old board out.
- Install — Mount the new board on the standoffs and reconnect every wire exactly per your photo.
- Test — Restore power, run a heating and cooling call, and confirm normal defrost and reversing-valve operation.
Signs You Need a Replacement
- Unit won't switch between heating and cooling (stuck reversing valve logic)
- System won't enter or exit defrost, causing outdoor coil icing
- Compressor short-cycles or won't energize on a valid thermostat call
- Blank or unresponsive board with repeatedly blown low-voltage fuses
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