ICP Control Board for RHS183S0AA0AAAA — 24V Defrost Board Kit | Ships Today
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Overview
This OEM control board kit (part 1183618) is the electronic brain of your ICP RHS183S0AA0AAAA heat pump. It manages the defrost cycle, compressor timing, reversing valve operation, and safety interlocks based on inputs from the 24V thermostat and the outdoor coil sensor. When this board fails, the unit may stop defrosting and ice over in heat mode, fail to switch between heating and cooling, short-cycle the compressor, or go completely unresponsive. The kit includes the board and required mounting hardware so you can restore full system control in a single service call. Because the board coordinates nearly every function of the outdoor unit, a marginal board can produce confusing, intermittent symptoms that mimic compressor, contactor, or thermostat faults.
Specifications
| Spec | Value |
|---|---|
| OEM Part Number | 1183618 |
| Type | Defrost / Timing Control Board Kit |
| Control Voltage | 24 VAC |
| Function | Defrost, compressor timing, reversing valve, safeties |
| Brand | ICP / Heil / Tempstar |
Compatibility
Built for the ICP RHS183S0AA0AAAA heat pump and used across matching Heil, Tempstar, Comfortmaker, and Day & Night R-410A heat pump platforms. Verify the board layout, connector count, and part number against your existing board before installing.
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 control panel cover to reach the mounted board.
- Document — Photograph every plug, wire color, and terminal location before disconnecting.
- Remove — Unplug the connectors, release the standoffs or screws, and lift out the old board.
- Install — Seat the new board on its standoffs and reconnect each harness exactly per your photo.
- Test — Restore power, run a heating and cooling cycle, and confirm proper defrost and changeover operation.
Signs You Need a Replacement
- Outdoor coil ices over because defrost never initiates.
- No switching between heating and cooling modes.
- Compressor short-cycles or will not start.
- Unit is completely unresponsive to thermostat calls.
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