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This OEM circuit control board (part 1178001) is the brain of your ICP / Tempstar / Heil WPH3244000RKC1 heat pump. It manages defrost timing, sequences the reversing valve, controls compressor and fan operation, and coordinates the 24V control circuit. A failed board causes erratic behavior — units stuck in defrost, ice build-up on the outdoor coil, a compressor that won't start, or a reversing valve that won't switch between heating and cooling. Specs: 24V control logic, OEM defrost board.
| Spec | Value |
|---|---|
| Part Number | 1178001 |
| Type | Defrost / Control Circuit Board |
| Brand | ICP (Tempstar / Heil) |
| Control Voltage | 24V |
| Fitment | OEM |
Engineered for the ICP WPH3244000RKC1 heat pump and compatible across ICP-family units (Tempstar, Heil, Comfortmaker) using this control board revision.
Ships same day before 3 PM CST. 30-day returns. Backed by the National HVAC Parts fitment guarantee.