ICP Heat Pump Control Board Kit for RHH036H0XA0AAAA — 24V Defrost Board | Ships Today
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Overview
This is a genuine OEM control board kit (part #1183618) for the ICP / Tempstar / Heil RHH036H0XA0AAAA heat pump. The control board is the brain of the outdoor unit, managing the defrost cycle, reversing valve switching, compressor staging, and 24V low-voltage signaling between the thermostat and the system. When this board fails, the heat pump may stop running entirely, get stuck in defrost, fail to switch between heating and cooling, or short-cycle the compressor. Replacing the board with an exact OEM kit restores reliable factory operation and protects the more expensive compressor and reversing valve from improper sequencing.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1183618 (KIT CONTROL BOARD) |
| Type | Heat Pump Defrost Control Board Kit |
| Brand | ICP / Tempstar / Heil |
| Control Voltage | 24V |
| Fits Model | RHH036H0XA0AAAA |
| Fitment | OEM Replacement |
Compatibility
Engineered as the factory replacement for the ICP RHH036H0XA0AAAA heat pump and shared across the ICP family of brands including Tempstar, Heil, Comfortmaker, and Arcoaire units that use OEM control board kit 1183618. Always confirm your existing board part number before ordering.
Installation Guide
- Safety First — Disconnect power at the outdoor disconnect and breaker, then verify zero voltage with a multimeter before touching the board.
- Access — Remove the control panel access cover on the outdoor unit.
- Document — Photograph every wire and connector position on the existing board before disconnecting anything.
- Remove — Label and unplug the low-voltage and line-voltage connectors, release the board standoffs/mounting screws, and lift out the failed board.
- Install — Mount the new OEM board kit on the same standoffs and reconnect every wire exactly per your photo and the kit instructions.
- Test — Restore power and verify the unit energizes, runs in heating and cooling, and completes a normal defrost cycle.
Signs You Need a Replacement
- Heat pump will not start or has no 24V control output.
- Unit stuck in defrost or never defrosts in cold weather.
- System fails to switch between heating and cooling modes.
- Visible burnt traces, scorched relays, or a melted connector 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