ICP Defrost Control Board for WCH3182GKA1 — Heat Pump | Ships Today
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Overview
This OEM defrost control board (part 1173636) is the timing and logic board that manages defrost cycles on the ICP / Tempstar / Heil WCH3182GKA1 heat pump. During heating operation, frost accumulates on the outdoor coil; the defrost board monitors the defrost thermostat and a timed interval (typically 30, 60, or 90 minutes), then initiates a defrost cycle by reversing the valve and energizing components to melt the ice. A failed defrost board leaves the outdoor coil iced over, which kills heating capacity and can damage the compressor. Symptoms include a heat pump that freezes solid in winter, no defrost cycle, a unit that won't switch into heat, or erratic fan and compressor behavior.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1173636 |
| Type | Defrost Control Board |
| Brand | ICP / Tempstar / Heil |
| Function | Heat Pump Defrost Timing & Logic |
| Control Voltage | 24V |
| Fits Model | WCH3182GKA1 |
| Fit | OEM Replacement |
Compatibility
Direct OEM replacement for the ICP / Tempstar / Heil WCH3182GKA1 heat pump. This board is the factory-matched defrost control for this unit's reversing valve, defrost thermostat, and fan/compressor circuits — confirm the part number stamped on your existing board matches before ordering.
Installation Guide
- Safety First — Disconnect power at the disconnect and verify zero voltage with a multimeter.
- Access — Remove the condenser control panel to expose the defrost board.
- Document — Photograph every wire and connector position on the board before removing anything; note the defrost time-select pin setting.
- Remove — Unplug the connectors, release the board's standoffs or screws, and lift it out.
- Install — Mount the new board, set the defrost time-select pin to match the original, and reconnect every wire per your photo.
- Test — Restore power and confirm normal heating operation; initiate a forced defrost (per the board's test pins) to verify the cycle engages.
Signs You Need a Replacement
- Outdoor coil ices over and never defrosts in heating mode
- Heat pump won't initiate or complete a defrost cycle
- No changeover into heating or erratic fan/compressor cycling
- Visible burn marks, corrosion, or cracked traces on 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