Tempstar Defrost Control Board for T2H330GKD200 — 24V Heat Pump Board | Ships Today

Overview

This is a genuine OEM defrost control board (part number 1173636) for the Tempstar T2H330GKD200 heat pump. The defrost control board manages the outdoor unit's defrost cycle — it watches coil temperature and accumulated run time, then triggers the reversing valve and auxiliary heat to melt frost and ice off the outdoor coil in cold weather. It also handles compressor timing, fan control, and 24V signaling between the thermostat and the unit. A failed board leads to a coil that ices over, lost heating capacity, short-cycling, or a unit that ignores the thermostat. The correct OEM board restores proper defrost timing and protects the compressor.

Specifications

Compatibility

Direct-fit replacement for the Tempstar T2H330GKD200 heat pump. This board is also used across many ICP-family (Heil, Comfortmaker, Tempstar, Arcoaire) heat pumps that share the 1173636 defrost board. Verify the part number on your existing board before ordering.

Installation Guide

1. Safety First — Disconnect power at the disconnect box and breaker, then verify zero voltage with a multimeter.
2. Access — Remove the outdoor unit's control-panel access cover.
3. Document — Photograph every wire and terminal on the existing board before disconnecting.
4. Remove — Label and disconnect the leads, release the board's standoffs/screws, and lift out the old board.
5. Install — Mount the new board on the standoffs and reconnect each wire exactly per your photo.
6. Test — Restore power and confirm normal heating, fan, and a forced defrost cycle.

Signs You Need a Replacement

• Outdoor coil freezes over and the unit never defrosts.
• Heat pump won't enter or exit defrost mode.
• Compressor or outdoor fan won't run on a valid thermostat call.
• Burn marks, corrosion, or a failed relay on the board.

Shipping & Returns

Ships same day before 3 PM CST. 30-day returns. Backed by the National HVAC Parts fitment guarantee.