Tempstar Defrost Control Board for T4H460GKD100 — OEM 1173636 | Ships Today
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Overview
This OEM defrost control board (part number 1173636) is the brains of the defrost cycle in your Tempstar T4H460GKD100 heat pump. In heating mode, frost builds on the outdoor coil; the defrost board monitors coil temperature and elapsed time, then temporarily reverses the system to melt that ice and restore efficiency. When the board fails, the heat pump may ice over solid, never defrost, defrost too often, or fail to switch the reversing valve and auxiliary heat correctly. Symptoms include a frozen outdoor coil, weak heating output, the unit stuck in defrost, or no response to a heating call. A working defrost board is essential for reliable cold-weather performance and to prevent coil and compressor damage.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1173636 |
| Type | Defrost Control Board |
| Brand | Tempstar (ICP) |
| Function | Defrost Timing & Coil Sensing |
| Application | Heat Pump Outdoor Unit |
| Fitment | OEM Exact-Fit |
Compatibility
Exact-fit OEM replacement for the Tempstar T4H460GKD100 and related ICP/Heil/Tempstar/Comfortmaker heat pumps that call for defrost board 1173636. Match the part number and connector layout to the original board before installing.
Installation Guide
- Safety First — Disconnect power at the outdoor disconnect and verify zero voltage with a multimeter.
- Access — Remove the control-compartment service panel.
- Document — Photograph every harness plug, sensor lead, and jumper/dip-switch setting before disconnecting.
- Remove — Unplug each connector, release the board standoffs or screws, and lift out the old board.
- Install — Mount the new board, replicate any jumper/dip-switch settings, and reconnect each plug per your photo.
- Test — Restore power, initiate a defrost test, and confirm proper cycle timing and reversing-valve operation.
Signs You Need a Replacement
- Outdoor coil freezes over and never clears
- Heat pump stuck running in defrost mode
- Weak or no heating output in cold weather
- Auxiliary heat or reversing valve not engaging on schedule
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