Tempstar PTAC Thermostat for TEA09K25STC — OEM Part 1058517 | Ships Today

Overview

This is the OEM PTAC thermostat (part number 1058517, TSTAT PTAC X) for the Tempstar TEA09K25STC packaged terminal air conditioner. The thermostat is the brain of the PTAC unit — it reads room temperature and signals the compressor, fan, and heat circuits to maintain your setpoint. When it fails, the unit may stop responding to temperature changes, short-cycle, run continuously, or fail to switch between heating and cooling modes. Installing the exact OEM control ensures correct mode logic, fan-speed staging, and electrical compatibility with the TEA09K25STC board.

Specifications

Compatibility

Designed as a direct OEM replacement for the Tempstar TEA09K25STC PTAC. This same control (1058517) is shared across the ICP/Tempstar/Heil TEA09K25 family. Always confirm your unit's model and serial tag before ordering.

Installation Guide

1. Safety First — Disconnect power at the unit and breaker, then verify zero voltage with a multimeter.
2. Access — Remove the PTAC front cover and control-area service panel.
3. Document — Photograph all thermostat wiring and connector positions before disconnecting.
4. Remove — Unplug the harness from the old thermostat and release its mounting clips/screws.
5. Install — Mount the new 1058517 control and reconnect the harness exactly per your photo.
6. Test — Restore power and verify cooling, heating, and fan-mode operation.

Signs You Need a Replacement

• Unit ignores setpoint changes or won't power the compressor.
• Short-cycling or continuous running regardless of room temperature.
• No switching between heat and cool modes.
• Blank or unresponsive controls / erratic fan behavior.

Shipping & Returns

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