Tempstar Pressure Switch Set for TSH518GKA200 — 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 TSH518GKA200 heat pump, including part 1184656 (PRESSURE SWITCH HI) and 1184655 (PRESSURE SWITCH LO). These 24V safety switches monitor refrigerant pressure on the high and low sides of the system and open the control circuit if pressure climbs too high or drops too low, shutting down the compressor before it can be damaged. The high-pressure switch protects against blocked condenser airflow, overcharge, or a failing fan; the low-pressure switch protects against loss of charge, a restricted metering device, or evaporator airflow problems. A stuck-open switch will prevent the system from starting, while a failed switch can allow damaging operating conditions to continue.
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 TSH518GKA200 condensing unit. These switches are shared across many ICP, Heil, and Comfortmaker heat pumps that use the same sealed-system safety design. Confirm the OEM part numbers and fitting type before installing.
Installation Guide
- Safety First — Disconnect power and verify zero voltage with a multimeter; recover or isolate refrigerant per the switch connection type.
- Access — Remove the service panel to reach the high- and low-side switch locations on the refrigerant lines.
- Document — Photograph the wire leads and routing for both the Hi and Lo switches.
- Remove — Disconnect the 24V leads and unthread or unclip the failed switch from its port.
- Install — Thread on the new switch with proper sealant or gasket, 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 with normal refrigerant charge
- Compressor will not start and the control board flashes a pressure-switch code
- Visible corrosion or refrigerant oil at the switch body
- Switch fails a continuity test 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