Tempstar PTAC Thermostat for THA15K34STC — 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 THA15K34STC heat pump system. The thermostat is the control brain of your unit — it reads room temperature and signals the compressor, fan, and reversing valve to cycle heating and cooling. A failed thermostat is one of the most common causes of a system that won't start, runs constantly, or cannot hold a setpoint. This is the same part used by Tempstar, Heil, and ICP for compatible PTAC and packaged equipment, ensuring a precise electrical and mechanical fit.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1058517 |
| Description | TSTAT PTAC X |
| Type | PTAC Thermostat / Control |
| Brand | Tempstar (Heil / ICP) |
| Fits Model | THA15K34STC |
| Fit | OEM Direct Replacement |
Compatibility
This thermostat is the factory-specified control for the Tempstar THA15K34STC. Because Tempstar, Heil, Comfortmaker, and ICP share a common parts platform, OEM part 1058517 also fits a range of compatible PTAC and packaged heat pump models from these brands. Always confirm your unit's part number against 1058517 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 front service panel to reach the control/thermostat assembly.
- Document — Photograph all thermostat wiring connections before disconnecting anything.
- Remove — Disconnect the low-voltage leads, release the mounting clips or screws, and lift out the old thermostat.
- Install — Mount the new 1058517 thermostat and reconnect each wire exactly per your photo.
- Test — Restore power and verify the unit responds to heating, cooling, and fan commands at the setpoint.
Signs You Need a Replacement
- Unit will not turn on or fails to respond to temperature changes.
- System short-cycles or runs continuously without reaching the setpoint.
- Display is blank, frozen, or shows erratic readings.
- Heating and cooling modes do not switch correctly.
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