Tempstar Defrost Control Board for T4H442GKC200 — Heat Pump Defrost Board | Ships Today
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Overview
This genuine OEM defrost control board (part number 1173636) manages the defrost cycle on your Tempstar T4H442GKC200 heat pump. It monitors coil temperature and run time, then periodically reverses the system to melt frost off the outdoor coil before returning to heating. The board also coordinates the compressor, condenser fan, reversing valve, and auxiliary heat timing. When it fails, the outdoor coil ices over and chokes airflow, the unit gets stuck in or out of defrost, or the heat pump stops responding to calls entirely. Symptoms include a heavily frosted outdoor coil, no defrost cycle, continuous defrost, fan or compressor not energizing, or no output to the reversing valve.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1173636 |
| Type | Defrost Control Board |
| Brand | Tempstar (ICP / Heil) |
| Function | Defrost timing & outdoor unit control |
| Fit | OEM Direct Replacement |
Compatibility
Exact-fit OEM replacement for the Tempstar T4H442GKC200 and related ICP-family (Tempstar, Heil, Comfortmaker) heat pumps using the 1173636 defrost board. Confirm the board part number, connector layout, and defrost timing pin settings against your existing board before installing.
Installation Guide
- Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter.
- Access — Remove the control-area service panel to expose the defrost board.
- Document — Photograph every connector, plug, and the defrost-time jumper position before disconnecting.
- Remove — Unplug the harnesses, release the board standoffs/screws, and lift out the old board.
- Install — Mount the new board, set the defrost timing pin to match the original, and reconnect each harness per your photo.
- Test — Restore power, run a heat call, and confirm normal operation and a proper defrost cycle.
Signs You Need a Replacement
- Outdoor coil ices over with no defrost cycle
- Unit stuck running continuous defrost
- Compressor or fan won't energize on a heat call
- No 24V output to the reversing valve during defrost
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