ICP Defrost Control Board for WCH3602GKA1 — Heat Pump | Ships Today
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Overview
This is the OEM defrost control board (part number 1173636) for the ICP / Heil / Tempstar WCH3602GKA1 heat pump. In heating mode the outdoor coil acts as the evaporator and accumulates frost; the defrost control board monitors time and coil temperature, then periodically reverses the system into a short defrost cycle to melt that ice so the unit can keep heating efficiently. The board sequences the reversing valve, condenser fan, and auxiliary/emergency heat during defrost, and protects the compressor with timing logic. When this board fails, the heat pump either never defrosts — letting the outdoor coil ice over into a solid block — or defrosts constantly, blowing cold air indoors and spiking the electric bill.
Specifications
| Spec | Value |
|---|---|
| OEM Part Number | 1173636 |
| Type | Defrost Control Board |
| Brand | ICP / Heil / Tempstar |
| Control Voltage | 24V |
| Function | Heat Pump Defrost Timing & Sequencing |
| Fits Model | WCH3602GKA1 |
Compatibility
Direct OEM replacement for the WCH3602GKA1 heat pump and the equivalent ICP-family units marketed under Heil, Tempstar, Comfortmaker, and Arcoaire. Defrost boards are model-specific — confirm the part number and connector layout against your existing board before installing.
Installation Guide
- Safety First — Disconnect power at the disconnect and breaker; verify zero voltage with a multimeter.
- Access — Remove the condenser control/electrical panel.
- Document — Photograph every wire and connector on the old board before unplugging.
- Remove — Disconnect harnesses and the defrost thermostat sensor leads; unclip or unscrew the old board.
- Install — Mount the new board and reconnect each harness exactly per your photo, including the coil temperature sensor.
- Test — Restore power, run a heating call, and verify normal operation; initiate a defrost test if your board supports the speed-up jumper.
Signs You Need a Replacement
- Outdoor coil ices over and never defrosts in heating mode
- Unit goes into defrost constantly, blowing cold air indoors
- Reversing valve or fan not sequencing during defrost
- No response on a heating call despite good 24V to the board
Shipping & Returns
Ships same day on orders placed 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