Tempstar Defrost Control Board for TXH524GKA100 — OEM 1173636 24V Heat Pump | Ships Today
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Overview
This is the genuine OEM defrost control board (part number 1173636) for the Tempstar TXH524GKA100 heat pump. The defrost control board manages the entire defrost cycle of your outdoor unit: it reads coil and ambient temperatures, times the defrost intervals, and switches the reversing valve and auxiliary heat to melt frost off the outdoor coil during heating operation. It runs on a 24V control signal and sequences the compressor contactor, outdoor fan, and reversing valve coil. A failed board leaves the unit unable to defrost, causing ice buildup, poor or no heating, and changeover problems. Common failure symptoms include a frozen outdoor coil, a unit stuck in defrost, no heat-pump heat, or relays that never energize.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1173636 |
| Type | Defrost Control Board |
| Brand | Tempstar |
| Control Voltage | 24V |
| Application | Heat Pump Defrost |
| Fitment | OEM |
Compatibility
Engineered as a direct-fit replacement for the Tempstar TXH524GKA100 heat pump. The 1173636 board is also used across related ICP/Heil/Tempstar/Comfortmaker heat-pump platforms. Confirm your unit's model and the printed part number on the existing board before ordering.
Installation Guide
- Safety First — Disconnect power at the breaker and the outdoor disconnect, then verify zero voltage with a multimeter.
- Access — Remove the outdoor unit's control-access service panel.
- Document — Photograph every wire and terminal position on the existing board before disconnecting anything.
- Remove — Label and unplug the low-voltage and line connectors, release the mounting standoffs/screws, and lift out the old defrost board.
- Install — Mount the new 1173636 board, reconnect each wire exactly per your photos, and set any defrost timing jumper to match the original.
- Test — Restore power, run a heat-pump call, and verify the unit cycles, energizes the reversing valve, and initiates/terminates defrost correctly.
Signs You Need a Replacement
- Outdoor coil ices over and never clears in heating mode
- Unit gets stuck in defrost or never enters defrost
- No heat-pump heating or no changeover between heat and cool
- Contactor, fan, or reversing valve relays fail to energize
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