ICP Defrost Control Board for WCH5184GKA100 — 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 WCH5184GKA100 heat pump. The defrost board is the brain of the outdoor unit's defrost cycle — it monitors coil temperature and run time, then commands the reversing valve and outdoor fan to clear frost buildup from the condenser coil during heating season. It also manages compressor anti-short-cycle timing and relays low-voltage 24V calls between the thermostat, contactor, and reversing valve. When this board fails, the heat pump can ice over completely, lock out the compressor, or run continuously without ever defrosting — symptoms that mimic a refrigerant or compressor problem but are actually a controls failure.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1173636 |
| Type | Demand/Timed Defrost Control Board |
| Brand | ICP (Tempstar / Heil) |
| Control Voltage | 24V |
| Fits Model | WCH5184GKA100 |
| Fit | OEM Replacement |
Compatibility
Designed as a direct OEM fit for the ICP/Tempstar/Heil WCH5184GKA100 heat pump and shared chassis variants across the ICP family (Comfortmaker, Arcoaire, KeepRite). Always 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 board's 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