Tempstar Low Pressure Switch Assembly for T4H560GKD200 — 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 T4H560GKD200 heat pump. The low pressure switch is a normally-closed safety control wired into the 24V control circuit. It continuously monitors refrigerant suction pressure and opens the circuit if pressure drops below the factory threshold — protecting the compressor from running on a low charge, a blocked metering device, or a loss-of-charge condition. When this switch fails or trips, the outdoor unit will not energize the compressor, leaving you with no cooling or no heat-pump heating. Common failure symptoms include a system that hums but never starts, nuisance lockouts on cold mornings, or a unit that short-cycles and then stays off.
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
Engineered as a direct-fit replacement for the Tempstar T4H560GKD200 heat pump condensing unit. This same assembly is shared across many ICP-family (Heil, Comfortmaker, Tempstar) heat pumps of this generation — always confirm the 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 before touching any wiring.
- Access — Remove the service panel from the condensing unit to expose the refrigerant lines and control wiring.
- Document — Photograph the existing switch wiring and its tap location before disconnecting anything.
- Remove — Recover or pump down as required, then unsolder/unscrew the failed switch from its Schrader or brazed fitting and disconnect the two 24V leads.
- Install — Mount the new switch on the suction line port, reconnect the 24V leads per your photo, and leak-check the connection.
- Test — Restore power and confirm the unit starts and holds the call without tripping into lockout.
Signs You Need a Replacement
- Compressor will not start even though the contactor pulls in
- Repeated low-pressure lockouts with a verified-good refrigerant charge
- Switch fails a continuity test at normal operating pressure
- Visible corrosion, cracked housing, 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