ICP Control Board Kit for RHH048S0XA0AAAA — OEM Heat Pump Defrost Board | Ships Today
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Overview
This genuine OEM control board kit (part number 1183618, KIT CONTROL BOARD) is the electronic brain of the ICP / Tempstar / Heil RHH048S0XA0AAAA 4-ton heat pump. The board manages defrost timing and termination, anti-short-cycle delays, reversing valve and contactor energizing, and the condenser fan and compressor sequencing in response to thermostat and sensor inputs. Supplied as a complete kit with the hardware and connectors needed for a clean swap. When the board fails, the heat pump may not start, may stay locked in defrost, ice over the outdoor coil, fail to switch between heat and cool, or trip on safety lockouts. Replacing a failed board restores correct timing and sequencing across the entire system.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1183618 |
| Type | Heat Pump Defrost / Control Board Kit |
| Control Voltage | 24 Volt |
| Brand | ICP (Tempstar / Heil) |
| Supplied As | Complete Replacement Kit |
| Fitment | OEM |
Compatibility
Built for the RHH048S0XA0AAAA heat pump and matching ICP-family Tempstar, Heil, and Comfortmaker heat pumps that use this control board kit. Match your existing board part number or kit reference before ordering, as control boards are model-specific.
Installation Guide
- Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter before touching the board.
- Access — Remove the service panel to reach the control box and board mount.
- Document — Photograph every wire harness, plug, and sensor connection before disconnecting.
- Remove — Unplug the harnesses, release the board standoffs or screws, and lift out the old board.
- Install — Mount the new board from the kit, transfer connections one at a time per your photo, and set any jumpers or defrost timing to match the original.
- Test — Restore power, run heat and cool modes, and confirm normal sequencing and defrost operation.
Signs You Need a Replacement
- Heat pump won't start or randomly shuts down
- Outdoor coil ices over or unit stuck in defrost
- No switching between heating and cooling
- Burn marks, swollen components, or relay clicking with no output
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