ICP Defrost Control Board for WCH3304GKA1 — 24V Heat Pump Board | Ships Today
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Overview
This OEM defrost control board (part 1173636) manages the defrost cycle on the ICP/Heil/Tempstar WCH3304GKA1 heat pump condenser. It monitors coil temperature and accumulated run time, then commands the reversing valve, terminates fan operation, and energizes the outdoor coil to clear frost build-up during heating mode. It also coordinates the compressor time-delay and high/low pressure safety inputs. When this board fails, the unit may run continuously in defrost, never defrost at all (ice on the outdoor coil), short-cycle the compressor, or fail to call for heat. Replacing it with a genuine 24V OEM board restores correct sequencing and protects the compressor.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1173636 |
| Type | Defrost Control Board |
| Brand | ICP / Heil / Tempstar / Comfortmaker |
| Control Voltage | 24V |
| Application | Heat Pump Defrost Control |
| Fitment | OEM Direct Replacement |
Compatibility
Engineered as the factory defrost board for the WCH3304GKA1 condensing unit and other ICP-family (Heil, Tempstar, Comfortmaker, Arcoaire) heat pumps using the same control platform. Always confirm the part number on your existing board matches 1173636 before installing.
Installation Guide
- Safety First — Disconnect power at the breaker and verify zero voltage at the board with a multimeter.
- Access — Remove the condenser control-panel cover.
- Document — Photograph every wire and connector position before disconnecting anything.
- Remove — Unplug the wiring harnesses and sensor leads, then unscrew the old board from its standoffs.
- Install — Mount the new board, reconnect each lead to the matching terminal per your photo, and seat the defrost sensor.
- Test — Restore power, initiate a defrost test per the unit instructions, and confirm proper reversing-valve and fan sequencing.
Signs You Need a Replacement
- Outdoor coil ices over and never defrosts in heating mode.
- Unit stays stuck in defrost or short-cycles between modes.
- No 24V output to the reversing valve or compressor contactor.
- Visible burn marks, scorched relays, or corrosion 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