Tempstar Defrost Control Board for T4H461GKD100 — OEM 1173636 | Ships Today
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Overview
The Tempstar defrost control board (OEM #1173636) is the brain of the defrost cycle on your T4H461GKD100 heat pump. It monitors outdoor coil temperature and run time, then commands the reversing valve, compressor, and outdoor fan to clear frost and ice from the outdoor coil during cold-weather operation. When this board fails, the system can no longer initiate or terminate defrost correctly — leaving the outdoor unit caked in ice, blowing cold air on heat mode, or short-cycling. This is a genuine OEM replacement, calibrated to the exact defrost intervals and sensor inputs your unit was engineered around, so you avoid the trial-and-error of universal aftermarket boards.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1173636 |
| Type | Defrost Control Board |
| Brand | Tempstar (ICP / Heil) |
| Control Voltage | 24V |
| Application | Heat Pump Outdoor Unit |
| Fits Model | T4H461GKD100 |
Compatibility
Engineered for the Tempstar T4H461GKD100 heat pump and shared across many ICP-family outdoor units, including Heil, Comfortmaker, and Carrier/Bryant-built equivalents that use the same defrost platform. Always confirm the OEM number (1173636) against your old board before installing.
Installation Guide
- Safety First — Disconnect power at the disconnect and breaker; verify zero voltage with a multimeter.
- Access — Remove the outdoor unit's control-panel access cover.
- Document — Photograph every wire and terminal position before disconnecting anything.
- Remove — Label and unplug all low- and line-voltage connectors, release the board's mounting standoffs/screws, and lift out the old board.
- Install — Seat the new board on the standoffs, reconnect each wire to its matching terminal per your photo, and confirm the defrost sensor lead is secure.
- Test — Restore power and run a heat-mode/defrost cycle to verify the reversing valve and outdoor fan respond correctly.
Signs You Need a Replacement
- Outdoor coil builds heavy ice and never defrosts
- Heat pump blows cold air in heating mode
- System short-cycles or won't initiate defrost
- Visible burnt traces, scorched relays, or a chemical smell on the old board
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