Tempstar Low Pressure Switch Assembly for T4H560GKD100 — 24V Heat Pump Safety Control | Ships Today
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Overview
This is the genuine OEM Low Pressure Switch Assembly (part #1177594) for the Tempstar T4H560GKD100 heat pump. The low pressure switch is a normally-closed safety control wired into the 24V control circuit that monitors refrigerant suction pressure. If pressure falls below the factory threshold — from a low charge, a restricted metering device, or a loss-of-charge leak — the switch opens and de-energizes the compressor circuit, protecting the compressor from damaging low-pressure operation. A failed or tripped switch prevents the outdoor unit from starting, causing no cooling or no heat-pump heating. Typical symptoms are a unit that hums but won't start, nuisance lockouts on cold mornings, and intermittent short-cycling.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1177594 |
| Type | Low Pressure Switch Assembly |
| Brand | Tempstar |
| Control Voltage | 24V |
| Circuit | Normally Closed (auto-reset) |
| Application | Heat Pump / Compressor Protection |
Compatibility
Direct-fit replacement for the Tempstar T4H560GKD100 heat pump condensing unit, and shared across many ICP-family (Heil, Comfortmaker, Tempstar) heat pumps of this generation. Confirm OEM part number 1177594 against your unit's parts list before ordering.
Installation Guide
- Safety First — Disconnect power at the outdoor disconnect and verify zero voltage at the contactor with a multimeter.
- Access — Remove the service panel to expose the refrigerant lines and control wiring.
- Document — Photograph the existing switch, its leads, and its port location before disconnecting.
- Remove — Recover or pump down as required, disconnect the two 24V leads, and remove the failed switch from its fitting.
- Install — Mount the new switch on the suction-line port, reconnect the 24V leads per your photo, and leak-check.
- Test — Restore power and confirm the unit starts and holds the call without tripping into lockout.
Signs You Need a Replacement
- Compressor won't start even though the contactor pulls in
- Repeated low-pressure lockouts with a verified-good charge
- Switch fails a continuity test at normal operating pressure
- Corroded housing, cracked body, or damaged leads
Shipping & Returns
Ships same day on orders placed before 3 PM CST. 30-day hassle-free 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