When something’s wrong with your HVAC system, one of the first places to look is your thermostat. Most models have a digital display that will show a specific numerical error code. This error code can be used to help diagnose 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 compare 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 potential 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 throughout 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 immediately shuts down the outdoor unit. This is called a lockout and is a safety feature intended to minimize 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 instead of the low-pressure switch on its own. Once the cause has been uncovered, technicians will 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
Swapping out a low-pressure shutoff switch can depend on the specific model of your outdoor unit. You may expect to pay between $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, namely the high-pressure switch. This switch is a safety feature that releases excess pressure inside the furnace, such as when airflow is blocked. When this error code appears, it means the pressure switch will not close. Without consistent airflow and pressure, the furnace won’t work as efficiently.
Fixing the Problem
The technician will check the high-pressure switch to see how it functions. They’ll measure the pressure while it tries to close during a heating cycle as well as its general operating pressure. If they notice a problem, an obstruction preventing airflow is the most common culprit. There are several places to look, such as the vent and combustion air inducer. Technicians will inspect both these components as well as the condensate drain to locate the blockage.
Estimated Repair Cost
Because there are multiple places to look before an obstruction can be found, labor costs should be considered when resolving error code 225. Ultimately, the final cost of this furnace repair will depend on where the problem is l