Tempstar PTAC Low-Temp Thermostat for TEB12R50DCA — Ships Today
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Overview
This OEM thermostat assembly is the complete temperature-control package for the Tempstar TEB12R50DCA PTAC unit. It combines the control knob (OEM 1058437), the PTAC thermostat body (OEM 1058517), and a low-temperature cutout thermostat (OEM 1059022). The low-temp thermostat protects the unit in cold conditions — it locks out the compressor when ambient or coil temperature drops too low, preventing icing and compressor damage in heat-pump operation. Together these controls manage setpoint, cycling, and cold-weather protection. Symptoms of failure include erratic cycling, no compressor operation in cold weather, or a control that ignores the knob entirely.
Specifications
| Spec | Value |
|---|---|
| OEM Part Numbers | 1058437 (Knob), 1058517 (Thermostat), 1059022 (Low-Temp) |
| Type | PTAC Thermostat with Low-Temp Cutout |
| Brand | Tempstar |
| Control Voltage | 24V |
| Includes | Knob + Thermostat + Low-Temp Thermostat |
| Fitment | OEM Direct Replacement |
Compatibility
Direct OEM replacement for the Tempstar TEB12R50DCA PTAC unit and related ICP / Tempstar / Heil TEB-series terminal units that use a low-temperature lockout. Match your existing part numbers (1058437 / 1058517 / 1059022) to the unit's service label before ordering.
Installation Guide
- Safety First — Disconnect power at the unit disconnect and verify zero voltage with a multimeter before servicing.
- Access — Remove the PTAC front cover and thermostat trim panel.
- Document — Photograph the thermostat wiring, low-temp sensor placement, and knob orientation.
- Remove — Pull the knob, disconnect thermostat and low-temp leads, and unclip both controls from their brackets.
- Install — Mount the new thermostat and low-temp cutout, reconnect leads per your photo, and press on the new knob.
- Test — Restore power, run through heat and cool, and confirm the low-temp cutout allows normal operation at room temperature.
Signs You Need a Replacement
- Compressor won't run in cold weather even on a valid call.
- Unit short-cycles or runs continuously regardless of setpoint.
- Knob has no detents or spins freely.
- Cracked, melted, or discolored thermostat housing.
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