ICP Control Board Kit for RHS181S0BA0AAAA — OEM Heat Pump Defrost Control | Ships Today
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Overview
This is the genuine OEM control board kit (part 1183618) for the ICP / Tempstar / Heil RHS181S0BA0AAAA heat pump. The control board is the brain of the outdoor unit — it manages the defrost cycle, sequences the compressor and condenser fan, energizes the reversing valve and 24V control circuit, and protects the system through anti-short-cycle and timing logic. On a heat pump the defrost control is especially critical: it monitors coil temperature and run time, then periodically reverses the unit to melt frost off the outdoor coil so heating capacity isn't lost in cold weather. When the board fails, you may see no heat, no defrost (ice buildup on the coil), a fan or compressor that won't run, or erratic mode switching. This kit ships as a complete plug-in replacement so a technician can swap it without rewiring from scratch.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1183618 |
| Type | Defrost / control board kit |
| Control Voltage | 24V |
| Brand | ICP / Tempstar / Heil |
| Fitment | OEM replacement kit |
| Application | Heat pump outdoor unit |
Compatibility
Built for the ICP, Tempstar, and Heil RHS181S0BA0AAAA heat pump and the R-series condensing units that originally shipped with the 1183618 control board. Match the old board's part number and connector layout before installing.
Installation Guide
- Safety First — Disconnect power at the breaker and outdoor disconnect; verify zero voltage with a multimeter before touching the board.
- Access — Remove the condenser control-panel service cover to expose the board.
- Document — Photograph every connector and wire position, and note any DIP switch / defrost timing settings.
- Remove — Unplug each harness, release the board standoffs/screws, and lift the old board out.
- Install — Mount the new 1183618 board, transfer connectors per your photo, and set defrost timing pins to match the original.
- Test — Restore power, run a heating cycle, and verify the compressor, fan, reversing valve, and defrost initiate correctly.
Signs You Need a Replacement
- Outdoor coil ices over with no defrost cycle
- No heat, or compressor/fan won't energize
- Erratic switching between heating and cooling
- Burnt smell, scorched traces, or relays that won't click
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