Tempstar Defrost Control Board for TXH548GKA200 — OEM Heat Pump Board | Ships Today
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Overview
This genuine OEM defrost control board (part number 1173636) is the brain of the Tempstar TXH548GKA200 heat pump's outdoor section. It monitors coil temperature and run time, then initiates and terminates the defrost cycle that clears frost from the outdoor coil in heating mode. It also sequences the reversing valve, condenser fan, and auxiliary heat during defrost. When this board fails, the heat pump can ice over solid, lose heating capacity, run continuous or never-ending defrost, or fail to switch between heating and cooling. Symptoms include a frosted outdoor coil that never clears, no defrost at all, the unit stuck in defrost, or erratic reversing-valve behavior.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1173636 |
| Type | Defrost Control Board |
| Brand | Tempstar (ICP / Heil) |
| Control Voltage | 24V |
| Function | Timed/demand defrost, reversing-valve & fan sequencing |
| Application | Heat Pump (outdoor unit) |
| Fitment | OEM |
Compatibility
Engineered as the factory-correct replacement for the Tempstar TXH548GKA200 heat pump and used across matching ICP-family (Heil, Comfortmaker, Tempstar) heat pumps. Match the board part number, terminal layout, and defrost timing-pin options to your original before installing.
Installation Guide
- Safety First — Disconnect outdoor power and verify zero voltage with a multimeter before opening the control box.
- Access — Remove the condenser service panel to reach the control board.
- Document — Photograph every wire and connector, and note the defrost timing-pin (jumper) position.
- Remove — Unplug the connectors, release the board standoffs/screws, and lift out the old board.
- Install — Mount the new board, set the defrost timing pin to match, and reconnect each wire/connector per your photo.
- Test — Restore power, force a defrost cycle, and confirm the reversing valve, fan, and aux heat respond correctly.
Signs You Need a Replacement
- Outdoor coil ices over and never defrosts in heating mode
- Unit stuck in continuous defrost or never enters defrost
- No 24V output to the reversing valve or fan during defrost
- Visible burnt traces, scorched relays, or swollen components 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