Tempstar Defrost Control Board for TXH536GKA200 — Heat Pump Defrost | Ships Today
OEM Guaranteed
Same-Day Ship
30-Day Returns
Secure Checkout
Overview
This is the genuine OEM Tempstar defrost control board, part number 1173636, for the TXH536GKA200 heat pump condensing unit. The defrost control board governs the outdoor unit's heating cycle — it watches coil temperature and accumulated run time, then triggers a timed defrost to melt ice off the outdoor coil so the heat pump keeps producing heat. During defrost it energizes the reversing valve, stages the compressor and outdoor fan, and signals the indoor unit. A failed board causes the coil to frost over, defrost to run nonstop or never start, or the system to stop switching between heating and cooling. It runs on a 24V control circuit and is the correct factory replacement for this model.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1173636 |
| Type | Defrost Control Board |
| Brand | Tempstar (ICP / Heil family) |
| Control Voltage | 24V |
| Application | Heat Pump Outdoor Unit |
| Fit | OEM Direct Replacement |
Compatibility
Built as the factory-correct defrost board for the Tempstar TXH536GKA200 heat pump. Because Tempstar shares components across the ICP family, this board also services equivalent Heil, Comfortmaker, and ICP units that originally specified part 1173636. Always verify the printed part number on your existing board before ordering.
Installation Guide
- Safety First — Disconnect power at the outdoor disconnect and breaker; verify zero voltage with a multimeter before touching wiring.
- Access — Remove the control-panel access cover on the condensing unit.
- Document — Photograph every wire and terminal on the existing board before disconnecting anything.
- Remove — Label and unplug the harnesses, then unscrew the failed board from its standoffs.
- Install — Mount the new board on the standoffs and reconnect each harness exactly per your photos and labels.
- Test — Restore power, force a defrost cycle, and confirm the reversing valve, compressor, and fan sequence correctly.
Signs You Need a Replacement
- Outdoor coil ices over and heating output falls off.
- Unit stuck in continuous defrost or never defrosting.
- No changeover between heat and cool (reversing valve not energizing).
- Visible burn marks, corrosion, or failed relays on the existing 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