Tempstar Pressure Switch Set for TSH536HKA100 – Hi/Lo 24V | Ships Today
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Overview
This OEM refrigerant pressure switch set for the Tempstar TSH536HKA100 includes the high-pressure switch (part 1184656) and the low-pressure switch (part 1184655). These 24V safety switches protect the compressor by interrupting the control circuit when refrigerant pressure climbs too high (blocked condenser, failed fan, overcharge) or drops too low (loss of charge, restriction, low ambient). A failed or stuck switch is a frequent cause of nuisance lockouts and no-cool/no-heat calls on heat pumps. Typical symptoms include the unit short-cycling, locking out on a pressure fault, or refusing to start while the rest of the controls test good. Replacing both switches as a set restores proper compressor protection.
Specifications
| Spec | Value |
|---|---|
| Part Numbers | 1184656 (HI), 1184655 (LO) |
| Type | High & Low Refrigerant Pressure Switch |
| Control Voltage | 24V |
| Function | Compressor Safety Lockout |
| Brand | Tempstar / ICP / Heil |
| Fit | OEM Replacement |
Compatibility
Direct-fit OEM replacement for the Tempstar TSH536HKA100 heat pump and the matching ICP/Heil/Comfortmaker condensing units that share this refrigerant circuit. Match part numbers to your existing high- and low-side switches before installing.
Installation Guide
- Safety First – Disconnect power at the outdoor disconnect and verify zero voltage with a multimeter.
- Access – Remove the service panel to reach the refrigerant lines and switch connections.
- Document – Photograph the wiring at each pressure switch before disconnecting.
- Remove – Disconnect the leads and unthread the old switch from its Schrader-style port (these are typically auto-reset, no recovery needed on quick-connect ports).
- Install – Thread the new switch onto the matching high or low port and reconnect the 24V leads per your photo.
- Test – Restore power, run the system, and confirm the switches are closed and not tripping under normal pressures.
Signs You Need a Replacement
- Compressor locks out on a high- or low-pressure fault with no real pressure problem
- Unit short-cycles or won't start despite good thermostat and contactor
- Switch fails a continuity test at normal operating pressure
- Corroded or damaged switch body or terminals
Shipping & Returns
Ships same day before 3 PM CST. 30-day returns. 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