Tempstar Defrost Control Board for TCH248AKA1 — OEM 1086070 | Ships Today

Overview

This genuine OEM defrost control board (part number 1086070) is the logic center of your Tempstar TCH248AKA1 heat pump's defrost cycle. It monitors the defrost thermostat and timer intervals, then commands the reversing valve, outdoor fan, and auxiliary heat to clear frost from the outdoor coil during cold-weather operation. When this board fails, the heat pump can ice over solid, lose heating capacity, short-cycle, or skip defrost entirely. The board manages 24V control signals and the high-voltage relays for the outdoor fan and compressor circuit. It is a direct OEM replacement that preserves the factory defrost timing and sequencing.

Specifications

Compatibility

Built for the Tempstar TCH248AKA1 heat pump and used across matching ICP, Heil, Comfortmaker, and Arcoaire outdoor units with the same defrost board layout and connector configuration. Match the existing board part number and terminal pinout before installing.

Installation Guide

1. Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter.
2. Access — Remove the condenser control-box access panel.
3. Document — Photograph every connector and wire position; note the defrost timer jumper setting (30/60/90 min).
4. Remove — Unplug the connectors, release the standoffs or screws, and lift out the old board.
5. Install — Mount the new board, match the timer jumper to the original, and reconnect all leads per your photo.
6. Test — Restore power, run a heat call, and confirm the unit enters and exits defrost correctly.

Signs You Need a Replacement

• Outdoor coil ices over and never clears
• Heat pump never enters defrost in cold weather
• Reversing valve or outdoor fan fails to switch during defrost
• Random short-cycling or no response to a heat call

Shipping & Returns

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