What the code means
Err 174.00: Suction pressure sensor fault
The Trane variable-speed alert table identifies SUCT P SENSE when the suction pressure transducer is missing, open, shorted, or out of range.
Troubleshooting code
Back to all 5TWV8X24A1 error codes
Trane 5TWV8X24A1 Err 174.00 troubleshooting
Suction pressure sensor fault. Use this page to document the issue and prepare for service. GreenFlow should handle diagnosis for electrical, refrigerant, lockout, or recurring conditions.
Safe checks before calling
- Confirm the thermostat is on, set correctly, and calling for heating or cooling.
- Check the air filter and visible return-air path for obvious airflow restrictions.
- Look around the outdoor unit for leaves, snow, ice, or other visible obstructions without opening the cabinet.
- Take photos of the thermostat, outdoor unit, nameplate, and any visible flash pattern before scheduling service.
When to stop and call GreenFlow
Call GreenFlow if the code repeats, the system is locked out, heating or cooling is not restored, there is ice buildup, electrical odor, unusual noise, or any issue involving pressure switches, sensors, wiring, refrigerant, reversing-valve operation, or warranty coverage.
Share the visible code, model and serial number if available, photos, current symptoms, and whether the issue affects heating, cooling, or both.
Err 174.00 questions
What does Err 174.00 mean on a Trane 5TWV8X24A1?
The Trane variable-speed alert table identifies SUCT P SENSE when the suction pressure transducer is missing, open, shorted, or out of range.
What Trane message is associated with Err 174.00?
The Trane source used for this page associates Err 174.00 with "Suction pressure sensor fault". Match the visible display text, LED pattern, or alert wording to the exact code whenever possible.
What system area does Err 174.00 point to?
This code is grouped under suction pressure transducer in the source-backed Trane troubleshooting data.
Which Trane documentation supports this Err 174.00 page?
Source-backed Trane 5T-V8X-SF-1C-EN Service Facts variable-speed alert-code table for 5TWV8X/5TTV8X outdoor units.
Is Err 174.00 a sensor-related alert?
Yes. The documented row connects Err 174.00 to suction pressure transducer. Sensor-related alerts should be interpreted by the exact code and operating mode rather than grouped with unrelated sensor faults.
Is Err 174.00 related to a pressure safety condition?
The Trane source row places this code in a pressure-related system area: Suction pressure transducer. Do not treat a pressure-safety code as a thermostat-only issue.
Is Err 174.00 tied to the refrigerant circuit?
The source-backed row points to refrigerant-circuit or refrigerant-control context: Suction pressure transducer. Use the documented code text rather than assuming a single cause such as charge, airflow, or valve position.
What information should be captured for Err 174.00 before clearing alerts?
Capture the exact code, any displayed alert text, the model and serial number, thermostat or control status, operating mode, symptoms, and photos of the display or LED pattern before the alert history is cleared.
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