Carrier Infinity fault 179 means outdoor communication is lost on supported models. Learn safe checks and what to report for Greater Vancouver service.
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Updated 2026-09-17 · CANRO Heating & Cooling
Carrier’s 25VNA8 / 24VNA9 service manual lists 179 as loss of communication with the outdoor AOC board. The wall control needs that communication to coordinate operation. When communication is unavailable, heating or cooling may be interrupted, but the message alone does not identify which component caused the interruption.
This guide concerns the Infinity communication fault, not every Carrier product that displays the number 179. Commercial controls and other equipment families have their own code tables. Match the full message and model number to the applicable manual before using troubleshooting information.
A lit thermostat does not establish that every part of the system has power. Similarly, a spinning indoor fan does not establish that the outdoor controller is communicating. These observations help describe the symptom; they are not a reason to open the outdoor cabinet.
Read the full thermostat alert and check the normal heating or cooling settings. Check whether the home has a wider power interruption. You may observe the position of a clearly labelled breaker from a dry, accessible location, but do not remove an electrical cover or operate a damaged or wet disconnect.
If a breaker has tripped, tell the technician. Repeatedly resetting it can mask a fault. If the owner’s manual gives a restart procedure, use it only in the conditions that manual permits; do not use generic internet reset sequences to force an unresponsive system to operate.
Separate the code from an emergency. Fault 179 alone is not a gas-leak diagnosis. If you smell gas, leave the building and call the gas utility emergency line from outside. If a carbon-monoxide alarm sounds or someone may have CO symptoms, leave and call 911. Smoke, burning electrical smells or water around electrical equipment require immediate attention, regardless of the displayed code.
Tell CANRO the complete alert, model numbers and whether you have lost heating or cooling. We will confirm appointment availability for your Greater Vancouver address.
📞 (604) 359-1081Request a quoteThe service visit should establish whether the outdoor equipment has the required supply and whether the communication path is intact. Depending on the exact system, the technician may need to check connections, wiring, controls and board operation using Carrier’s diagnostic sequence. A component should be condemned on test results, not on the wall-control number alone.
Ask for an explanation of what was measured, which component or connection failed, and how normal communication was confirmed after correction. On an intermittent fault, a useful service record also includes the conditions in which it occurs. That is more informative than replacing several boards without a confirmed cause.
Not necessarily. A communication issue and an end-of-life heat pump are different questions. Once the cause is established, compare the repair quote, parts availability, warranty terms and wider equipment condition. If replacement is being proposed, ask why repairing the confirmed fault would not be practical.
Read our heat-pump repair-or-replace guide for the decision factors. Keep your existing URL or service record when contacting us; a detailed description is more useful than searching for a different name for the same code.
Sources checked 2026-09-17. Equipment manuals and program terms can change. Use the documentation for your exact model or application.
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