Tempstar Defrost Control Board for T4H436GKB200 — OEM 1173636 Heat Pump Board | Ships Today
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Overview
This genuine OEM defrost control board (part number 1173636) manages the defrost cycle on your Tempstar T4H436GKB200 heat pump. During cold-weather operation, frost accumulates on the outdoor coil and reduces heating efficiency. The defrost control board monitors coil temperature and run time, then commands a defrost cycle — reversing the refrigerant flow and energizing the auxiliary heat to clear ice from the coil. When this board fails, the unit may freeze over, stop heating, short-cycle, or run the defrost cycle continuously. A failed board is one of the most common causes of poor heat-pump performance in winter.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1173636 |
| Type | Defrost Control Board |
| Brand | Tempstar (ICP / Heil) |
| Control Voltage | 24V |
| Application | Heat Pump Defrost Control |
| Fitment | OEM Replacement |
Compatibility
Engineered as a direct OEM replacement for the Tempstar T4H436GKB200 heat pump. This board is shared across multiple ICP-family heat pumps (Tempstar, Heil, Comfortmaker, Arcoaire) — confirm part number 1173636 matches the board currently installed in your unit before ordering.
Installation Guide
- Safety First — Disconnect power at the outdoor disconnect and the breaker. Verify zero voltage with a multimeter before touching any wiring.
- Access — Remove the outdoor unit's control-panel service cover.
- Document — Photograph every wire and terminal position before disconnecting anything.
- Remove — Label and disconnect the low-voltage and sensor leads, release the board's mounting standoffs or screws, and lift out the old board.
- Install — Mount the new 1173636 board, reconnect each lead to the matching terminal per your photo, and seat the defrost sensor.
- Test — Restore power and initiate a test defrost (jumper the speed-up pins per the unit's wiring diagram) to confirm the reversing valve and aux heat energize.
Signs You Need a Replacement
- Outdoor coil ices over and the unit never defrosts
- Heat pump runs a defrost cycle constantly or at the wrong intervals
- No heat output or frequent short-cycling in cold weather
- Reversing valve or auxiliary heat fails to energize on call for defrost
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