ICP Control Board Kit for RHS243H0CA0AAAA – OEM Defrost/Heat Pump Board | Ships Today
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Overview
This OEM control board kit (P/N 1183618) is the electronic brain of your ICP / Heil / Tempstar RHS243H0CA0AAAA heat pump. It manages the defrost cycle, compressor and reversing-valve timing, fan sequencing, and the safety lockouts that protect the system. The board reads the defrost thermostat and timer settings to decide when to melt frost off the outdoor coil during heating, then returns the unit to normal operation. Because it carries 24V control logic and switches relays under load, the board is vulnerable to power surges, lightning, moisture intrusion, and simple age. Common failure symptoms include a heat pump that won't switch between heating and cooling, no defrost (coil iced over), erratic compressor cycling, blank or no diagnostic LED, or burned/scorched traces on the board itself.
Specifications
| Spec | Value |
|---|---|
| OEM Part Number | 1183618 (Kit) |
| Type | Defrost / Heat Pump Control Board Kit |
| Brand | ICP (Heil / Tempstar / Comfortmaker) |
| Control Voltage | 24 VAC |
| Function | Defrost, compressor & reversing-valve sequencing |
| Fitment | RHS243H0CA0AAAA |
Compatibility
Engineered for the ICP / Heil / Tempstar RHS243H0CA0AAAA heat pump. This is a factory kit, so it includes the board and the hardware needed for a direct replacement. Match the OEM part number on your existing board before ordering — control boards vary by model and revision.
Installation Guide
- Safety First – Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter.
- Access – Remove the condenser control-box cover to reach the board.
- Document – Photograph every wire and connector position before unplugging anything.
- Remove – Unplug the harnesses, release the board standoffs/screws, and lift out the old board.
- Install – Seat the new board on the standoffs and reconnect each harness exactly per your photo; set any dip switches/jumpers to match the original.
- Test – Restore power, run a heating and cooling call, and confirm proper defrost and changeover operation.
Signs You Need a Replacement
- Outdoor coil icing over with no defrost cycle
- Unit won't switch between heat and cool
- Erratic or short compressor cycling
- Visible burn marks, corrosion, or a dead diagnostic LED
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