Tempstar Pressure Switch Set for TSH542HKA200 — Hi & Lo Refrigerant Switches | Ships Today
OEM Guaranteed
Same-Day Ship
30-Day Returns
Secure Checkout
Overview
This OEM pressure switch set keeps your Tempstar TSH542HKA200 heat pump operating safely by monitoring refrigerant pressure on both the high and low sides. The high-pressure switch (part 1184656) opens to shut down the compressor when discharge pressure climbs too high — a common result of a dirty condenser coil, blocked airflow, or an overcharged system. The low-pressure switch (part 1184655) protects against loss of charge, a failed metering device, or low ambient operation. When either switch fails, the unit may short-cycle, fail to start, or lock out entirely. Replacing both switches as a set ensures complete refrigerant safety protection.
Specifications
| Spec | Value |
|---|---|
| OEM Part Numbers | 1184656 (HI), 1184655 (LO) |
| Type | High & Low Refrigerant Pressure Switch |
| Brand | Tempstar (ICP / Heil) |
| Function | Compressor protection |
| Fitment | OEM direct replacement |
Compatibility
Engineered for the Tempstar TSH542HKA200 heat pump. Because ICP, Heil, Tempstar, Comfortmaker, and Day & Night units share common components, these switches also fit many equivalent models built on the same platform. Always confirm against your unit's OEM part numbers.
Installation Guide
- Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter. Recover or confirm system is not under pressure where required.
- Access — Remove the condenser service panel.
- Document — Photograph all wiring before disconnecting.
- Remove — Disconnect the spade terminals from the failed switch and unthread/release it from the refrigerant port (Schrader-style depressor type, no charge loss).
- Install — Thread the new switch onto the matching port and reconnect wiring per your photo.
- Test — Restore power and verify the system starts and runs without nuisance lockout.
Signs You Need a Replacement
- Compressor won't start or trips on lockout
- System short-cycles on and off
- Switch fails a continuity test at normal operating pressure
- Visible corrosion or damaged terminals on the switch body
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