ICP Defrost Control Board for WCH5424GKA100 — Heat Pump Demand Defrost | Ships Today
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Overview
This OEM defrost control board (part #1173636) manages the defrost cycle on your ICP / Tempstar / Heil heat pump. It monitors coil temperature and run time, then commands the reversing valve, energizes the compressor, and stops the outdoor fan to clear frost from the outdoor coil during cold-weather operation. When this board fails, the unit either skips defrost entirely — letting the coil ice over and choke airflow — or locks into a continuous defrost loop that wastes energy and blows cold air indoors. A 24V control circuit drives the relays and timing logic.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1173636 |
| Type | Defrost Control Board |
| Brand | ICP / Tempstar / Heil |
| Control Voltage | 24V |
| Function | Time/Temperature Defrost |
| Fitment | OEM Replacement |
Compatibility
Engineered for ICP-family heat pumps including model WCH5424GKA100 and related Tempstar, Heil, and Comfortmaker condensing units that use board #1173636. Confirm your existing board part number before ordering.
Installation Guide
- Safety First — Disconnect power at the breaker and verify zero voltage with a multimeter.
- Access — Remove the outdoor unit's control-panel access cover.
- Document — Photograph every wire and terminal before disconnecting anything.
- Remove — Label and unplug each connector, release the board standoffs, and lift out the old board.
- Install — Mount the new board on the standoffs and reconnect each wire exactly per your photo.
- Test — Restore power and confirm normal heat-pump and defrost operation.
Signs You Need a Replacement
- Outdoor coil ices over and never defrosts
- Unit stuck in continuous defrost or blowing cold air in heat mode
- Reversing valve or outdoor fan fails to switch during defrost
- No 24V output to the defrost relays
Shipping & Returns
Ships same day before 3 PM CST. 30-day returns. 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