Tempstar Defrost Control Board for TXH530GKA100 — OEM 1173636 | Ships Today
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Overview
This is the OEM defrost control board (part number 1173636) for the Tempstar TXH530GKA100 heat pump. The defrost control board governs the entire heat-pump cycle of the outdoor unit — it reads coil temperature and accumulated run time, energizes the reversing valve, and triggers a timed or demand defrost to clear frost from the outdoor coil in heating mode. It also coordinates the contactor coil, fan delay, and 24V signaling between the indoor and outdoor sections. A failed board commonly results in an iced-over coil, no changeover between heating and cooling, short-cycling, or a unit that won't run.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1173636 |
| Type | Defrost Control Board |
| Brand | Tempstar (ICP / Heil) |
| Control Voltage | 24V |
| Application | Heat Pump — Outdoor Unit |
| Fit | OEM Exact Replacement |
Compatibility
Direct fit for the Tempstar TXH530GKA100 heat pump and other ICP-family condensers (Tempstar, Heil, Comfortmaker, Arcoaire) that originally shipped with board 1173636. Always confirm the number on your existing board before ordering.
Installation Guide
- Safety First — Disconnect power at the outdoor disconnect and breaker, then verify zero voltage at the board with a multimeter.
- Access — Remove the control-panel service cover on the outdoor unit.
- Document — Photograph every wire and terminal before disconnecting anything.
- Remove — Label and unplug the low-voltage harness and line connections, then unsnap or unscrew the old board from its standoffs.
- Install — Mount the new 1173636 board and reconnect each wire exactly per your photo, matching the defrost-timer jumper to the original setting.
- Test — Restore power and confirm the unit runs in heating and cooling and that the reversing valve energizes on demand.
Signs You Need a Replacement
- Outdoor coil ices over and never defrosts in heating mode
- Unit won't switch between heating and cooling
- Contactor or reversing valve fails to energize
- Burnt smell, scorch marks, or visible damage on the 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