When something’s wrong with your HVAC system, one of the first places to check is your thermostat. Most models use a digital display that will display a specific numerical error code. This error code can be used to help determine the problem and speed up the troubleshooting and repair process for HVAC systems like your furnace.
This is even easier with smart thermostats like the Lennox iComfort model. Let’s take a look at three serious error codes—411, 225 and 31—to find out what the problem is. We’ll also share what steps your technician will take to resolve the problem, and the possible costs to do so.
Lennox Thermostat iComfort Error Code 411
Error code 411 is an urgent priority to take care of. You’ll see this error code appear when the outdoor unit’s low-pressure switch malfunctions five times or more during one heating or cooling cycle. Since this error code includes the outdoor unit, it can be involved with your air conditioner. Each time the low-pressure switch opens incorrectly, the error count increases. Once it passes five strikes, the thermostat automatically shuts down the outdoor unit. This is known as a lockout and is a safety feature designed to prevent