Tempstar Low Pressure Switch Assembly for T4H430GKD100 — OEM 1177594 | Ships Today
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Overview
This is a genuine OEM low pressure switch assembly (part number 1177594) for the Tempstar T4H430GKD100 outdoor unit. The low pressure switch is a safety control that monitors suction-side refrigerant pressure and opens the control circuit if pressure drops too low — protecting the compressor from running on a low charge, a restriction, or a frozen coil. When the switch fails or sticks open, the unit may short-cycle, lock out, or refuse to start even with a proper charge; when it sticks closed, it can let the compressor run unprotected. This factory assembly is matched to the original cut-out and cut-in pressure settings for reliable compressor protection.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1177594 |
| Type | Low Pressure Switch Assembly |
| Brand | Tempstar |
| Function | Suction-side low-pressure compressor protection |
| Application | Outdoor condensing/heat-pump unit |
| Fits Model | T4H430GKD100 |
Compatibility
Direct OEM replacement for the Tempstar T4H430GKD100 outdoor unit and other ICP-family units (Heil, Comfortmaker, ICP) using the same low pressure switch assembly. Confirm the original part number and fitting/connection type before ordering.
Installation Guide
- Safety First — Disconnect power at the outdoor disconnect and verify zero voltage with a multimeter; recover or isolate refrigerant if the switch is not on a Schrader fitting.
- Access — Remove the service/electrical panel to reach the switch and its leads.
- Document — Photograph the wiring and refrigerant connection before disconnecting.
- Remove — Disconnect the two control wires, then unthread the switch from its Schrader port or fitting.
- Install — Thread on the new switch (use a new core/seal as needed), reconnect the control wires per your photo.
- Test — Restore power, check for leaks, and confirm the unit starts and stays running under normal pressures.
Signs You Need a Replacement
- Unit locks out or won't start despite a correct refrigerant charge.
- Compressor short-cycles on the low-pressure safety.
- Switch tests open at normal operating pressure (or won't open when it should).
- Corroded, leaking, or physically damaged switch body or fitting.
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