Tempstar Defrost Control Board for T2H336GKA200 — Heat Pump OEM | Ships Today

Overview

This genuine OEM defrost control board (part number 1173636) is the logic center for the Tempstar T2H336GKA200 heat pump's defrost cycle. The board monitors the outdoor coil temperature and accumulated run time, then initiates a defrost cycle to clear frost and ice from the coil during heating operation. It coordinates the reversing valve, condenser fan, and auxiliary heat to melt ice without dumping cold air indoors. When this board fails, the outdoor coil can ice over solid, heating capacity drops, the unit short-cycles, or defrost never terminates. Because it manages timing, temperature sensing, and relay outputs, a failed defrost board is a common cause of poor winter heat-pump performance.

Specifications

Compatibility

Engineered as a direct-fit replacement for the Tempstar T2H336GKA200 heat pump and shared across compatible ICP, Heil, and Comfortmaker heat pumps using the same defrost control. Match the OEM part number and connector layout before installing.

Installation Guide

1. Safety First — Disconnect power at the breaker and verify zero voltage with a multimeter.
2. Access — Remove the condenser service/control panel.
3. Document — Photograph all wiring harness connections and pin positions before unplugging.
4. Remove — Unplug each harness, then unscrew or unclip the old board from its standoffs.
5. Install — Mount the new board and reconnect every harness exactly per your photo.
6. Test — Restore power, run a heating cycle, and confirm normal defrost initiation and termination.

Signs You Need a Replacement

• Outdoor coil freezes over with thick ice during heating
• Heat pump runs a continuous or stuck defrost cycle
• Weak heat output or frequent short-cycling in winter
• No reversing-valve switching or no defrost activation at all

Shipping & Returns

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