ICP Control Board Kit for RHH120S0CA0AAAA – Heat Pump Defrost Control | Ships Today
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Overview
This is the OEM control board kit (OEM #1183618) for the ICP/Tempstar/Heil RHH120S0CA0AAAA heat pump. The control board is the brain of the outdoor unit: it manages the defrost cycle, sequences the compressor contactor and reversing valve, monitors timing and safety inputs, and switches the 24V loads that drive the system. When the board fails you may see the unit stuck in defrost, no defrost at all (ice build-up on the coil), the reversing valve never energizing, intermittent no-cool/no-heat operation, or a completely unresponsive outdoor unit even with good thermostat voltage. Boards commonly fail from heat-cycled solder joints, blown traces after a power surge, or corroded relays.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1183618 |
| Type | Control Board Kit (Defrost / Sequencing) |
| Brand | ICP (Tempstar / Heil) |
| Control Voltage | 24V |
| Application | Heat Pump Outdoor Unit |
Compatibility
Factory replacement kit for the ICP/Tempstar/Heil RHH120S0CA0AAAA. Supplied as a complete kit so it includes the hardware needed to drop into the original board location. Confirm your unit's model and existing board part number before ordering, as control boards are model-specific.
Installation Guide
- Safety First – Disconnect power at the outdoor disconnect and verify zero voltage with a multimeter before touching the board.
- Access – Remove the control/electrical panel to expose the board.
- Document – Photograph every wire, plug, and terminal on the old board before unplugging anything.
- Remove – Disconnect all connectors and harnesses, then release the board from its standoffs or mounting screws.
- Install – Mount the new board, transfer any jumpers/settings, and reconnect each harness to the matching terminal per your photo.
- Test – Restore power and verify the unit responds to a thermostat call and initiates a normal defrost test cycle.
Signs You Need a Replacement
- Outdoor coil ices over – no defrost cycle
- Unit stuck running in defrost or short-cycling
- Reversing valve or contactor never energizes on a call
- Unresponsive outdoor unit with confirmed 24V at 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