Tempstar Defrost Control Board for T2H342GKB100 — OEM 1173636 24V | Ships Today
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Overview
The Tempstar 1173636 Defrost Control Board is the factory OEM control module for the T2H342GKB100 heat pump condensing unit. It governs the defrost cycle by reading outdoor coil temperature and accumulated compressor run time, then energizing the reversing valve and auxiliary heat to melt frost from the outdoor coil during heating. The board also sequences the compressor contactor, condenser fan, and anti-short-cycle timing on a 24V control circuit. A failed board lets the coil ice up, kills heating capacity, causes short-cycling, or skips defrost entirely. The genuine OEM board restores correct defrost logic and protects the compressor from liquid slugging.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1173636 |
| Type | Defrost Control Board |
| Brand | Tempstar (ICP / Heil) |
| Control Voltage | 24V |
| Application | Heat Pump Condensing Unit |
| Fit | OEM Direct Replacement |
Compatibility
Engineered for the Tempstar T2H342GKB100 heat pump and matching ICP/Heil family units that originally shipped with defrost board 1173636. Verify the part number printed 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.
- Access — Remove the control panel access cover on the condensing unit.
- Document — Photograph every wire and terminal connection on the existing board before disconnecting.
- Remove — Label and unplug the low-voltage harness and sensor leads, then unscrew the old defrost board from its standoffs.
- Install — Mount the new 1173636 board, reconnect each wire exactly per your photos, and reseat the defrost sensor.
- Test — Restore power, run a heating call, and confirm proper defrost initiation and termination.
Signs You Need a Replacement
- Outdoor coil ices over and unit never enters defrost
- Heat pump short-cycles or fails to switch the reversing valve
- No 24V output to the contactor or reversing valve coil
- Visible burn marks, corrosion, or failed relays 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