ICP Defrost Control Board for WCH3482GKA1 — 24V Heat Pump | Ships Today
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Overview
This is a genuine OEM defrost control board (part #1173636) for the ICP / Heil / Tempstar heat pump model WCH3482GKA1. The defrost board is the brain of the outdoor unit during heating season — it monitors coil temperature and run time, then initiates and terminates the defrost cycle that melts frost off the outdoor coil. It also coordinates the reversing valve, compressor, outdoor fan, and auxiliary heat during defrost. When this 24V board fails, the heat pump cannot clear ice from the coil, efficiency collapses, and the system may lock out or trip on high pressure. Common failure signs include a coil that ices over solid, no defrost cycle, continuous defrost, or no compressor operation in heating mode.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1173636 |
| Type | Defrost Control Board |
| Brand | ICP / Heil / Tempstar |
| Control Voltage | 24V |
| Application | Heat Pump Outdoor Unit |
| Fitment | OEM Direct Replacement |
Compatibility
Direct OEM replacement for ICP-family heat pumps including model WCH3482GKA1 and related Heil, Tempstar, and Comfortmaker units that originally shipped with board 1173636. Always verify the part number printed on your existing board before ordering.
Installation Guide
- Safety First — Disconnect power at the outdoor disconnect and verify zero voltage with a multimeter.
- Access — Remove the outdoor unit control-panel service cover.
- Document — Photograph every wire and terminal connection before disconnecting anything.
- Remove — Label and disconnect all wiring harnesses and sensor leads, then unscrew the failed board from its standoffs.
- Install — Mount the new board, transfer the defrost sensor and all connections exactly per your photo, and confirm the defrost timing jumper matches the original (30/60/90 min).
- Test — Restore power, run the unit in heating mode, and confirm a normal defrost cycle initiates and terminates correctly.
Signs You Need a Replacement
- Outdoor coil ices over and never defrosts
- Unit gets stuck in continuous defrost
- No compressor or reversing-valve action in heat mode
- Visible burn marks, scorched traces, or a failed relay 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