When something’s wrong with your HVAC system, one of the first places to check is your thermostat. Many models use a digital display that will reveal 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 simpler with smart thermostats like the Lennox iComfort model. Let’s take a look at three serious error codes—411, 225 and 31—to learn what the problem is. We’ll also share what steps your technician will take to repair the problem, and the potential costs to do so.

Solving Error Code 411

Error code 411 is an urgent priority to resolve. 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 includes the outdoor unit, it might be involved with your air conditioner. Each time the low-pressure switch opens incorrectly, the error count increases. Once it reaches five strikes, the thermostat immediately shuts down the outdoor unit. This is known as a lockout and is a safety feature designed to minimize damage.

Fixing the Problem

A technician will check the system charge using several methods, as the issue could be with the switch’s power connections instead of the low-pressure switch on its own. Once the cause has been determined, technicians will reset the outdoor unit by putting it in test mode or by resetting low-voltage power. Once the issue is taken care of, the error code should automatically clear.

Estimated Repair Cost

Replacing a low-pressure shutoff switch can depend on the specific model of your outdoor unit. You may expect to pay anywhere from $200 to more than $600 depending on parts and air conditioning repair costs. The shutoff switch itself runs an average of $30 to $150.

Solving Error Code 225

Error code 225 is specific to your furnace, particularly the high-pressure switch. This switch is a safety feature that releases excess pressure within the furnace, such as when airflow is obstructed. When this error code appears, it means the pressure switch can’t 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 determine how it functions. They’ll measure the pressure while it tries to close during a heating cycle as well as its standard operating pressure. If they find a problem, an obstruction impacting airflow is the most likely culprit. There are a few places to check, such as the vent and combustion air inducer. Technicians will check both these components as well as the condensate drain to locate the blockage.

Estimated Repair Cost

Because there are a few 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 found as well as how long it takes the technician to determine the source.

Clearing Error Code 31

Seeing error code 31 on your thermostat means it hasn’t been able to communicate with your furnace for more than three minutes. Several components communicate with the thermostat, so you can find this error code when any of them malfunction or fail. Most of the time this can be traced back to an electrical issue, like damaged wiring or a loose connection.

Fixing the Problem

A technician can review all the connections and wiring of the communicating components of your furnace. They should test voltages and wiring ohms as particularly high resistance can result in a disconnection. With a special tool called a multimeter, technicians can find out where the disruption originated from. Sometimes this is the furnace’s float switch, a component that shuts off the furnace when the condensate drain pan is flooded.

Estimated Repair Cost

With multiple possible causes, it may be difficult to estimate the total repair costs of error code 31. Technicians will check the float switch to rule it out before thoroughly reviewing electrical wiring and connections. If the cause is damage or a failed component, replacement part costs should be included. You can expect to spend anywhere from $200 to more than $800 for higher-range models.