Tempstar Defrost Control Board for T2H324GKA100 — OEM 1173636 24V Heat Pump | Ships Today
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Overview
This is a genuine OEM defrost control board (part number 1173636) for the Tempstar T2H324GKA100 heat pump. During heating season the defrost board monitors outdoor coil temperature and compressor run time, then commands a timed defrost cycle — reversing the valve and cycling the outdoor fan to clear frost from the coil. It also routes the 24V signals that control the compressor contactor. A failed defrost board is one of the most common reasons a heat pump ices over, loses heating output, or short-cycles in cold weather.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1173636 |
| Type | Defrost Control Board |
| Brand | Tempstar (Heil / ICP / Comfortmaker family) |
| Control Voltage | 24V |
| Application | Heat Pump Outdoor Unit |
| Fitment | OEM Direct Replacement |
Compatibility
Engineered as a direct-fit replacement for the Tempstar T2H324GKA100 heat pump and other ICP-family condensing units that originally shipped with board 1173636. Because Tempstar, Heil, Comfortmaker, and ICP units share components, this board services equivalent models across those brands. Always confirm the printed part number on your existing board before ordering.
Installation Guide
- Safety First — Disconnect power at the outdoor disconnect and breaker, then verify zero voltage with a multimeter at the board terminals.
- Access — Remove the unit's electrical access panel.
- Document — Photograph every wire and connector position before disconnecting anything.
- Remove — Unplug the wiring harnesses and the defrost sensor leads, then remove the board's mounting screws or standoffs.
- Install — Mount the new 1173636 board and reconnect each harness and the defrost thermostat/sensor exactly per your photos.
- Test — Restore power, place the system in heating, and confirm a normal defrost cycle initiates and terminates correctly.
Signs You Need a Replacement
- Outdoor coil ices up and never clears during heating mode
- Heat pump won't enter or exit defrost
- Compressor or outdoor fan short-cycles or won't energize
- Visible burn marks, corrosion, or a blown relay on the existing board
Shipping & Returns
Ships same day on orders placed before 3 PM CST. 30-day returns on uninstalled parts. 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