ICP Control Board Kit for RHH120H0AA0AAAA — 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 RHH120H0AA0AAAA heat pump. The control board governs the defrost cycle, reversing-valve timing, compressor contactor signaling, and the 24V low-voltage logic that ties the thermostat to the outdoor unit. A failed board can leave the system unable to heat or cool, stuck in or out of defrost, short-cycling the compressor, or completely unresponsive. Symptoms often include blank diagnostic LEDs, repeatedly blown low-voltage fuses, and relays that never energize. Installing the correct OEM kit restores the factory defrost timing and built-in protection logic for reliable heat pump operation.
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 | RHH120H0AA0AAAA |
Compatibility
Direct OEM fit for the ICP RHH120H0AA0AAAA heat pump. The RHH platform is shared across ICP's Tempstar, Heil, Comfortmaker, and related family brands, so this kit also services equivalent units on the same chassis. Verify your existing board against part number 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 modes
- System won't enter or exit defrost, causing outdoor coil icing
- Compressor short-cycles or won't energize on a valid call
- Blank, 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