Tempstar Low Pressure Switch for T4H342GKE100 — Heat Pump Refrigerant Protection | Ships Today
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Overview
This is the genuine OEM Low Pressure Switch Assembly (OEM Part #1177594) for the Tempstar T4H342GKE100 heat pump. The low pressure switch is a refrigerant-side safety control that continuously monitors suction-line pressure. If pressure drops below the factory cut-out threshold — caused by a refrigerant leak, restricted metering device, or low ambient charge migration — the switch opens and interrupts the 24V control circuit to shut down the compressor before it is damaged by running in a starved condition. When pressure recovers, the auto-reset switch closes and normal operation resumes. A failed or stuck pressure switch is a leading cause of intermittent no-cool/no-heat lockouts and short-cycling.
Specifications
| Spec | Value |
|---|---|
| OEM Part Number | 1177594 |
| Description | Low Pressure Switch Assembly |
| Type | Low Pressure, Auto-Reset |
| Brand | Tempstar (ICP / Heil family) |
| Control Voltage | 24V |
| Application | Heat Pump / Condensing Unit |
| Fitment | OEM Direct Replacement |
Compatibility
Engineered as a direct OEM replacement for the Tempstar T4H342GKE100 heat pump. This switch is shared across many ICP-built Tempstar, Heil, Comfortmaker, and Carrier/Bryant private-label condensing units of the same platform. Always confirm the printed part number 1177594 against your old switch before installing.
Installation Guide
- Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage at the contactor with a multimeter.
- Access — Remove the condensing unit service/corner panel to expose the refrigerant lines and switch.
- Document — Photograph the two control wires and their terminals before disconnecting.
- Remove — Unplug the spade connectors. The switch is mounted on a Schrader-style fitting; back it off with a wrench while holding the fitting steady. Expect a brief refrigerant burp — the fitting is self-sealing.
- Install — Thread on the new switch, snug it to the fitting, and reconnect the control wires per your photo.
- Test — Restore power, start a call for cooling/heating, and confirm the compressor runs without nuisance lockout.
Signs You Need a Replacement
- Compressor will not start or trips out on a safety/lockout fault
- Intermittent no-cool or no-heat that clears after the unit sits
- Short-cycling on the low-pressure circuit
- Switch fails a continuity check at normal operating pressure
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