Tempstar Defrost Control Board for TCH236AKAA — OEM 1086070 24V | Ships Today

Overview

This genuine OEM Tempstar defrost control board (part number 1086070) is the brains of the defrost cycle on your TCH236AKAA heat pump condensing unit. It monitors coil temperature and run time, then commands the reversing valve and outdoor fan to clear frost from the outdoor coil during cold-weather operation. Operating on a 24V control signal, the board coordinates the defrost timer, sensor inputs, and compressor staging. When this board fails, the heat pump can ice over, lose heating capacity, short-cycle, or stop responding to the thermostat entirely. Replacing it with the correct OEM board restores reliable, efficient defrost operation.

Specifications

Compatibility

Designed as the factory defrost control for the Tempstar TCH236AKAA heat pump and shared ICP/Heil/Comfortmaker platforms using the same control architecture. Always confirm the original board part number before ordering.

Installation Guide

1. Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter.
2. Access — Remove the condensing unit control-panel cover.
3. Document — Photograph every wire and terminal position before disconnecting.
4. Remove — Label and disconnect the low-voltage and sensor leads, release the board standoffs, and lift out the old board.
5. Install — Snap the new board onto the standoffs and reconnect each wire exactly per your photo.
6. Test — Restore power and verify a normal call for heat and a proper defrost cycle.

Signs You Need a Replacement

• Outdoor coil ices over and the unit never defrosts
• Heat pump short-cycles or won't switch into defrost
• No 24V output to the reversing valve or fan during defrost
• Visible 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.