Tempstar Defrost Control Board for T4H560GKD300 — OEM 1173636 | Ships Today
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Overview
The OEM Tempstar Defrost Control Board (part number 1173636) is the brain of the defrost cycle on your T4H560GKD300 heat pump. It monitors coil temperature and run time, then commands the reversing valve, outdoor fan, and auxiliary heat to clear frost from the outdoor coil during cold-weather operation. When this 24V logic board fails, the system can no longer time or initiate defrost — leaving the outdoor coil to ice over, killing heating capacity, and tripping the unit on high or low pressure. Common failure signs include a heat pump that freezes solid in winter, no heat output, an outdoor fan that runs continuously, or blank/erratic LED diagnostic codes on the board itself. Installing a genuine OEM board restores correct defrost timing and protects the compressor from liquid slugging caused by mistimed reversing-valve switching.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1173636 |
| Type | Defrost Control Board |
| Brand | Tempstar (ICP / Heil family) |
| Control Voltage | 24V |
| Function | Demand / time-temperature defrost logic |
| Fitment | OEM direct replacement |
Compatibility
Engineered as a direct OEM fit for the Tempstar T4H560GKD300 heat pump and shared ICP / Heil / Comfortmaker / Heil platforms that use board 1173636. 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 with a multimeter.
- Access — Remove the outdoor unit control-panel cover.
- Document — Photograph every wire and terminal position before disconnecting anything.
- Remove — Label and unplug the low-voltage harnesses, release the board standoffs/screws, and lift out the old defrost board.
- Install — Snap the new 1173636 board onto the standoffs and reconnect each harness exactly per your photos, matching the W, Y, O, and sensor terminals.
- Test — Restore power, confirm the diagnostic LED is steady, and initiate a defrost test to verify reversing-valve and fan response.
Signs You Need a Replacement
- Outdoor coil ices up and never defrosts in heating mode
- No heat or weak heat output during cold weather
- Outdoor fan runs nonstop or won't shut off during defrost
- Burnt, scorched, or unlit diagnostic LEDs on the board
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