Tempstar PTAC Thermostat for THA12R50STC — OEM Part 1058517 | Ships Today
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Overview
This is the genuine OEM PTAC thermostat (part number 1058517, "TSTAT PTAC X") for the Tempstar THA12R50STC heat pump system. The thermostat is the command center of the unit, reading indoor temperature and signaling the system to call for heating or cooling. A failing thermostat is one of the most common causes of comfort complaints: when it loses calibration or its internal contacts wear out, the system may short-cycle, fail to reach setpoint, or stop responding to temperature changes entirely. Replacing it with a factory-matched control restores accurate, reliable operation without guesswork. This unit is built to the exact electrical and mounting specification of the original, ensuring proper 24V signaling to the contactor, reversing valve, and blower circuits.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1058517 |
| Type | PTAC Thermostat (TSTAT PTAC X) |
| Brand | Tempstar (ICP / Heil family) |
| Control Voltage | 24V |
| Application | Heat Pump / Air Handler |
| Fitment | OEM Direct Replacement |
Compatibility
Engineered as a direct-fit replacement for the Tempstar THA12R50STC model. Because ICP, Heil, Tempstar, and Comfortmaker share a common parts platform, part 1058517 is also used across closely related models in this PTAC and heat pump line. Always confirm the printed part number on your existing thermostat before ordering.
Installation Guide
- Safety First — Disconnect power at the breaker and verify zero voltage with a multimeter before touching any wiring.
- Access — Remove the unit's service panel or control cover to expose the thermostat.
- Document — Take a clear photo of every wire and terminal position before disconnecting anything.
- Remove — Label and disconnect the low-voltage leads, then release the mounting clips/screws and lift out the old thermostat.
- Install — Mount the new thermostat, then reconnect each wire to its matching terminal per your photo.
- Test — Restore power and verify the unit responds correctly to both heating and cooling setpoint changes.
Signs You Need a Replacement
- System fails to reach or hold the setpoint temperature.
- Unit short-cycles or runs continuously regardless of room temperature.
- No response when adjusting the temperature or mode.
- Blank, frozen, or erratic display/readout.
Shipping & Returns
Ships same day before 3 PM CST. 30-day returns. Backed by the National HVAC Parts fitment guarantee.
Shipping Information
- Orders placed before 3PM CST ship same business day
- Standard delivery: 2-5 business days
- Express shipping available at checkout
- Free shipping on orders over $75
- Tracking number emailed upon shipment
Return Policy
- 30-day returns on unused parts in original packaging
- Electrical parts (capacitors, contactors, control boards) are final sale once installed
- Email info@nationalhvacparts.com to initiate a return
- Refunds processed within 5-7 business days