Tempstar Pressure Switch Set for TSH518GKA100 — Hi & Lo 24V | Ships Today
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Overview
This is a genuine OEM high and low refrigerant pressure switch set for the Tempstar TSH518GKA100 heat pump, including part 1184656 (PRESSURE SWITCH HI) and 1184655 (PRESSURE SWITCH LO). These 24V safety switches continuously monitor high- and low-side refrigerant pressure and open the control circuit to shut down the compressor if pressure rises or falls outside safe limits. The high-pressure switch guards against overcharge, dirty condenser coils, or a stalled fan, while the low-pressure switch protects against low charge, a restricted metering device, or poor evaporator airflow. A switch stuck open prevents the unit from starting; a switch that fails to trip allows damaging pressure conditions to persist.
Specifications
| Spec | Value |
|---|---|
| Part Numbers | 1184656 (Hi), 1184655 (Lo) |
| Type | Refrigerant Pressure Switch, High & Low |
| Brand | Tempstar |
| Control Voltage | 24V |
| Function | Auto-reset compressor safety |
Compatibility
Direct-fit replacements for the Tempstar TSH518GKA100 condensing unit, and shared across many ICP, Heil, and Comfortmaker heat pumps using the same sealed-system safety design. Verify the OEM part numbers and fitting type before installing.
Installation Guide
- Safety First — Disconnect power and verify zero voltage with a multimeter; isolate or recover refrigerant per the switch connection type.
- Access — Remove the service panel to reach the high- and low-side switches on the refrigerant lines.
- Document — Photograph the 24V leads and routing for both switches.
- Remove — Disconnect the leads and unthread or unclip the failed switch from its port.
- Install — Thread on the new switch with the proper seal, then reconnect the leads to match your photo.
- Test — Restore power, start the system, and confirm normal operation with no nuisance lockouts.
Signs You Need a Replacement
- System locks out on a pressure fault despite a correct charge
- Compressor will not start and a pressure-switch fault code appears
- Corrosion or oil residue at the switch body
- Switch fails a continuity check at known-good pressures
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