Tempstar PTAC Thermostat for TEA12K34STA — OEM Part 1058517 | Ships Today

Overview

This is a genuine OEM PTAC thermostat (factory part number 1058517, "TSTAT PTAC X") for the Tempstar TEA12K34STA packaged terminal air conditioner/heat pump. The thermostat is the command center of the unit — it reads room temperature and signals the compressor, fan, and heating element to cycle on and off to hold 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. Installing the correct OEM control restores accurate temperature sensing and reliable mode switching without the guesswork of a universal aftermarket part.

Specifications

Compatibility

Engineered as a direct-fit replacement for the Tempstar TEA12K34STA. This OEM thermostat assembly matches the original factory control for plug-and-play installation. Always confirm your unit's model and the existing part number 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 front cover/service panel to expose the control area.
3. Document — Photograph all wiring and connector positions before disconnecting anything.
4. Remove — Unplug the thermostat harness/connectors and release the old thermostat from its mounting clips or screws.
5. Install — Mount the new OEM thermostat, route the sensor, and reconnect every wire exactly per your photo.
6. Test — Restore power, set a call for cooling and then heating, and confirm the unit cycles correctly and holds setpoint.

Signs You Need a Replacement

• Unit ignores temperature changes or won't reach setpoint
• Constant running or rapid short-cycling
• No response when switching between heat and cool modes
• Erratic or no display/control response

Shipping & Returns

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