What are the specs for this Pressure Switch?

The correct replacement for Tempstar model T4H348GKE100 — OEM 1177594 | Ships Today is this exact part. It is the factory-specified replacement with exact OEM specifications. Using a part with different specifications can cause equipment damage or void your warranty. You can verify this by checking the data plate on your Tempstar equipment which lists the model number T4H348GKE100 — OEM 1177594 | Ships Today.

Is this pressure switch compatible with Bryant or Payne systems too?

Many Tempstar parts are cross-compatible with Bryant and Payne systems since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across multiple brand labels with different model numbers. To verify cross-compatibility, check your Bryant or Payne equipment service manual for cross-compatible part numbers, or contact info@nationalhvacparts.com with your model number for confirmation.

Tempstar

Tempstar Low Pressure Switch for T4H348GKE100 — OEM 1177594 | Ships Today

Name: Tempstar Low Pressure Switch for T4H348GKE100 — OEM 1177594 | Ships Today
Brand: Tempstar
SKU: 1177594-GEN
Price: 34.00 USD
Availability: InStock

SKU: 1177594-GEN Brand: Tempstar

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Overview

This is the genuine OEM low pressure switch assembly (part number 1177594) for the Tempstar T4H348GKE100 heat pump. The low pressure switch is a refrigerant-side safety that opens the 24V control circuit when suction pressure drops below its setpoint — protecting the compressor from running on a lost or low refrigerant charge, a frozen coil, or a restricted line. A failed switch either nuisance-trips and shuts the system down with a normal charge, or sticks closed and lets the compressor run unprotected. Replacing it with the correct OEM assembly keeps the safety logic accurate.

Specifications

Spec	Value
Part Number	1177594
Type	Low Pressure Switch Assembly
Brand	Tempstar (ICP / Heil)
Control Voltage	24V
Application	Heat Pump Refrigerant Safety
Fit	OEM Replacement

Compatibility

Designed as the factory replacement for the Tempstar T4H348GKE100 heat pump. The same switch assembly is used across related ICP-built Heil and Comfortmaker units sharing this refrigerant circuit. Confirm part number 1177594 and connection style against your existing switch before ordering.

Installation Guide

Safety First — Disconnect power at the outdoor disconnect and breaker, then verify zero voltage with a multimeter.
Access — Remove the service panel to reach the switch on the suction line.
Document — Photograph the wiring and the switch location before removal.
Remove — Disconnect the leads and unthread the switch from its Schrader-style fitting (most units allow swap without recovering charge).
Install — Thread on the new switch, confirm the seal, and reconnect the leads as photographed.
Test — Restore power, run the system, and verify the safety circuit makes and the compressor operates normally.

Signs You Need a Replacement

System shuts down on a low pressure fault with a verified good charge.
Compressor will not start even though refrigerant pressure is normal.
Switch contacts stuck open or closed when tested with a meter.
Intermittent nuisance trips in heating or cooling.

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

Tempstar Low Pressure Switch for...

$34.00

Frequently Asked Questions

Does this Pressure Switch fit my Tempstar T4H348GKE100 — OEM 1177594 | Ships Today?

Yes. This is the factory-specified OEM pressure switch for the Tempstar T4H348GKE100 — OEM 1177594 | Ships Today. It is a direct drop-in replacement that fits without modification. Always verify the model number on your equipment nameplate before ordering.

How do I replace the pressure switch on my Tempstar T4H348GKE100 — OEM 1177594 | Ships Today?

Difficulty: Medium (20–30 min)
Step 1: Turn off power. Step 2: Locate pressure switch near draft inducer. Step 3: Note tubing orientation. Step 4: Disconnect tubing and wires. Step 5: Remove screw, install new switch. Step 6: Reconnect tubing and wires, restore power.

My furnace shows a pressure switch error. What do I replace?

Furnace LED showing pressure switch error = switch not detecting draft inducer airflow. Try first: clear the rubber tubing to the switch (often clogged with condensation). If problem persists, replace the pressure switch.

Is this pressure switch compatible with Bryant or Payne too?

Many Tempstar parts are cross-compatible with Bryant and Payne since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across brand labels with different model numbers. To verify: check your Bryant or Payne equipment service manual for cross-compatible part numbers, or email info@nationalhvacparts.com with your model number.

Should I use OEM or aftermarket for my Tempstar pressure switch?

OEM recommended for reliability and warranty compatibility. OEM parts match exact factory specifications for proper fit, performance, and safety. While aftermarket alternatives cost less upfront, the risk of improper fit and reduced lifespan usually makes OEM the better value long-term.

How fast does National HVAC Parts ship?

Orders placed before 3:00 PM CST ship the same business day. Standard delivery is 2–5 business days anywhere in the continental United States. Express shipping available at checkout. We ship from Houston, TX to all 50 states. 30-day return policy on all parts.

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