Lennox Air-conditioner 417 Error Code — Meaning & Causes (2026)
Outdoor unit discharge line temperature sensor is open, shorted, or reading out of range. Below: what triggers it and what to check — this code carries no single repair to price. Reviewed July 2026.
What 417 means
Outdoor unit discharge line temperature sensor is open, shorted, or reading out of range.
Likely causes, most common first
- Failed discharge line temperature sensor
- Sensor leads in the wrong harness pin positions
Base: 1 published national repair-cost guide (retrieved 2026-07) · full source registry on the methodology page · Code meaning & causes · Reviewed July 2026
No single repair to price for this code
417 doesn't point at one failed component, so we don't attach a price module — forcing a repair mapping here would be dishonest. If the code keeps returning, the underlying symptom (not the code) is what gets priced: browse the central air conditioning repair costs for the problem you're actually seeing.
Codes are universal — your location changes the repair price, never the code's meaning. See the methodology for the exact localization formula and sources.
Reviewed by a Red Seal–certified appliance technician who also holds a Technical Safety BC gas ticket (Gas-C) and an ODS/halocarbon refrigerant ticket (CFC/HCFC/HFC).