When something’s wrong with your HVAC system, one of the first places to look is your thermostat. Many models have a digital display that will reveal a specific numerical error code. This error code can be used to help diagnose the problem and streamline 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 compare three serious error codes—411, 225 and 31—to learn what the problem is. We’ll also cover what steps your technician will take to repair the problem, and the possible costs to do so.
Solved: 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 across one heating or cooling cycle. Since this error code involves the outdoor unit, it can be involved with your air conditioner. Every time the low-pressure switch opens incorrectly, the error count increases. Once it reaches five strikes, the thermostat immediately switches down the outdoor unit. This is called a lockout and is a safety feature intended to reduce damage.
Fixing the Problem
A technician will inspect the system charge using several methods, as the issue may be with the switch’s power connections rather than the low-pressure switch itself. Once the cause has been found, technicians can reset the outdoor unit by putting it in test mode or by resetting low-voltage power. Once the issue is fixed, the error code should automatically disappear.
Estimated Repair Cost
Replacing a low-pressure shutoff switch can depend on the specific model of your outdoor unit. You could expect to pay anywhere from $200 to more than $600 depending on parts and air conditioning repair costs. The shutoff switch itself costs an average of $30 to $150.
Lennox Thermostat iComfort Error Code 225
Error code 225 is specific to your furnace, particularly the high-pressure switch. This switch is a safety component that releases high pressure inside the furnace, such as when airflow is obstructed. When this error code shows up, it means the pressure switch won’t close. Without consistent airflow and pressure, the furnace won’t work as efficiently.
Fixing the Problem
The technician will watch the high-pressure switch to determine how it functions. They’ll measure the pressure while it t