ICP Defrost Control Board for WCH460GKA210 — Heat Pump Defrost Timer | Ships Today
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Overview
This is the OEM defrost control board (part #1173636) for the ICP/Tempstar/Heil WCH460GKA210 heat pump. The defrost board governs the outdoor unit's defrost cycle — it watches coil temperature and accumulated run time, then commands the reversing valve and outdoor fan to melt frost off the condenser coil during heating operation. It also handles compressor anti-short-cycle timing and routes the 24V signals between the thermostat, contactor, and reversing valve. A failed defrost board commonly causes the coil to ice solid, the compressor to lock out, or the unit to run without ever defrosting — problems that look like a refrigerant fault but are really a controls failure.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1173636 |
| Type | Demand/Timed Defrost Control Board |
| Brand | ICP (Tempstar / Heil) |
| Control Voltage | 24V |
| Fits Model | WCH460GKA210 |
| Fit | OEM Replacement |
Compatibility
Direct OEM fit for the ICP/Tempstar/Heil WCH460GKA210 heat pump and shared ICP-family chassis (Comfortmaker, Arcoaire, KeepRite). Confirm the printed part number on your existing board before ordering.
Installation Guide
- Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage at the board terminals with a multimeter.
- Access — Remove the outdoor unit's control-panel access cover.
- Document — Photograph every wire and connector position before disconnecting anything.
- Remove — Label and unplug the low-voltage and line connectors, release the mounting standoffs/screws, and lift out the old board.
- Install — Seat the new board on the standoffs and reconnect every wire to match your photo exactly.
- Test — Restore power, initiate a heating call, and verify the defrost cycle, reversing valve, and fan operation.
Signs You Need a Replacement
- Outdoor coil ices over and never clears during heating
- Compressor won't start or short-cycles on a heat call
- Defrost cycle runs constantly or not at all
- No 24V output to the contactor or reversing valve
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