The Lennox furnace is one of the finest home heating appliances available today; nonetheless, even the most reliable furnaces can have mechanical issues.
This all-inclusive troubleshooting guide for Lennox furnaces offers precise, step-by-step instructions for diagnosing and correcting all potential problems that may occur with a furnace.
The Lennox furnace error codes can be very complicated and complex to grasp. We recommend you seek expert assistance rather than trying to solve Lennox Furnace Error Codes E200/E201/E223/E227/E229/E250. These errors may be difficult to diagnose and repair.
However, If you wish to troubleshoot a particular issue with a Lennox furnace, you may use the contents list below to jump directly to that section.
Lennox Furnace Error Codes E200/ E201/ E223/ E227/ E229/ E250 Mean?
Lennox furnaces use a flashing light system to communicate error codes, with the codes E200, E201, E223, E227, E229, and E250 varying depending on the model.
You can decode the furnace error code by locating the LED light and observing its flashing pattern. Keep track of how often and how quickly the light blinks.
When you take off the front panel, you’ll find a list of problem codes and the actual code your furnace gives you.
#1. Error Code E200
The error code E200 indicates that the limit switch for the furnace’s rollout is open. When the furnace kicks into heating mode, a draft inducer fan is activated to force hot air out of the flue.
When the thermostat initially triggers heating, there will be a brief buzzing period before the furnace produces heat.
The gas burners ignite a whoosh after 15-45 seconds, and the flames are pulled into the heat exchanger by this airflow.
About a minute later, the primary fan activates and starts sucking air from your room through the cold air returns.
Combustion gas heat is transferred to the air as it flows across an extremely hot heat exchanger. After that, the heated air is via the supply registers, also known as vents, in each room/zone.
The term “flame rollout” refers to the phenomenon in which some of the burner flames roll out or rearward of the heat exchanger in your furnace.
The crucial control components behind the burners are overheated due to the errant flames, rather than only the heat exchanger at the furnace’s core.
If this condition persists for a significant time, the furnace’s internal components, such as the wiring and the control board, may get damaged.
#2. Error Code E201
The error code 201 indicates that there has been a break in connectivity with the indoor blower motor.
A lack of power, a brownout, an unpowered motor, faulty wiring, or an exposed breaker cover could all contribute to the issue.
The costs associated with repairs are contingent on aspects such as the nature of the damage and the anticipated length of time required to remedy the situation.
#3. Error Code E223
If your furnace displays error code 223, it signifies the low-pressure switch is open. The most common reasons for a pressure switch to get stuck open are:
#1. Emission Issues
The pressure switch may be open, preventing the furnace from venting correctly.
When this happens, it’s usually because the flue pipe is clogged, making it difficult for the system to vent the combustion gases outside.
Dirt and other debris are in the flue pipe. In addition, ice and snow may build up in the winter and make passage difficult.
It could be attached to the side of your home or displayed prominently on the roof. If there is any trash or other unwanted material within, you should get rid of it.
Turn on your furnace and see whether the problem persists after removing the obstruction. If this doesn’t work, you should contact a professional HVAC specialist.
#2. Pressure Switch Hose Blockage
Clogging or disconnection of the hose is another typical cause of a stuck open furnace pressure switch.
When checking the condition of the inducer motor, the pressure switch hose is the means of choice.
If the hose becomes clogged, detached, or otherwise compromised, the pressure switch may remain in the OFF position.
#4. Error Code 227
The Lennox E227 error code indicates that the low-pressure switch was open during the trial for ignition or run mode.
If there was water in the furnace when it stopped operating, snow or ice has probably blocked the vent pipe, and the condensate drain is probably frozen or clogged.
Fortunately, a few different troubleshooting approaches are available for the Lennox E227 error, each of which has a chance of resolving the problem.
The inducer, gas valve, and blower capacity are all adjustable, allowing the thermostat to “learn” your home’s energy needs and adjust heating and cooling accordingly.
The inducer is with the help of the two pressure switches, which serve as a safety mechanism if the flue pipes get obstructed or the equipment malfunctions in any other way.
#5. Error Code 229
The error code 229 for a Lennox furnace will be if a low-pressure switch cannot shut properly.
After the high-speed inducer closes the low and high-pressure switches, the furnace ignites a high fire.
When a continuous fan is running, the furnace goes into high fire mode for one minute to speed up the process of warming up the heat exchanger.
#6. Error Code 250
Heat loss might result from the Lennox furnace’s e250 error code, which is a frequent problem.
Repairing a broken furnace before it causes more costly damage is an excellent method to cut down on heating costs, as are new heating systems and regular maintenance.
The following are some of the indicators that may precede an E250 error:
- The heating system cannot be started or run.
- Alternating on/off cycles of the fan/blower may occur.
- The burner may seem to be malfunctioning.
How Do I Fix The Lennox Furnace Error Code E200?
Below are measures to fix your Lennox furnace with an error code E200.
- The rollout switch has to reset.
- Conduct a functional inspection of the furnace.
- Check to see if any of the vent pipes (intake or exhaust) are clogged or impeded in any way.
- Check the stability of the flame; if the flame is unsteady, you should contact an HVAC specialist.
How Do I Fix The Lennox Furnace Error Code E201?
First, check to see if the indoor unit has power and if a switch or breaker has yet to be off. Breakers are located directly on the Air Handler of specific indoor systems (heat pumps).
It would be best if you also inspected the main breaker panel. On some models, the power switch is positioned on the side of the device, while others have an emergency switch mounted on the wall.
Then check to see that the obstructions in your air filter have cleared away. There are occasions when that is the sole issue.
.You should try turning the fan switch on the thermostat to the “on” position. But first, examine the vents to see if the air is flowing out of them.
How Do I Fix The Lennox Furnace Error Code E223?
After passing the safety features, you can use your meter to follow the 24 volts from the controller unit to the pressure switch.
You should place one lead on the floor or a substantial metal connected to the furnace. The other one should be to the incoming terminal of the switch.
If the terminal entering the switch shows 24 volts, but the terminal exiting the switch does not, you can safely infer that the pressure switch has not yet closed.
Another method is verifying the connection by placing your leads across the two terminals.
Your meter will read 24 volts whenever the pressure switch is open. You will get a reading of 0 volts when the switch is closed.
It is important to remember that the pressure switch will only shut once the inducer motor has turned on and the required amount of suction has been provided for the pressure switch to close.
How Do I Fix The Lennox Furnace Error Code E227?
Now that we understand the factors that led to the Lennox E227 issue, we will get further knowledge on the potential solutions.
- Check the pressure of the low-pressure switch shutting when the heat is for in inches of the water column.
- Take readings of the operating pressure (inches w.c.).
- Conduct a check to ensure that the vent and the combustion air inducer are operating correctly and that there is no obstruction.
- Check the hoses to see if they are fractured.
- Verify the unit’s current level.
- The system returns to its normal operating state when the problem is over.
How Do I Fix The Lennox Furnace Error Code E229?
There’s a wide variety of potential triggers for the E229 error. However, the typical cause is a simple problem, such as a disconnected wire in the motor’s circuit.
For instance, if you’re having this problem when your furnace is on, you can usually remedy it by unplugging and replugging the cables.
When everything else fails, it may be time to bring in the experts. The same goes for an overheated motor or other electrical difficulties with the furnace.
Your Lennox heating system may be up and running again with just a little bit of examination and troubleshooting.
How Do I Fix The Lennox Furnace Error Code E250?
- Check that the fire rate of the furnace is appropriately set.
- Check to see that the heater is clear of any obstructions.
- Make sure there is enough ventilation.
- If the limit is not closed within three minutes, the device will enter a soft lockout for one hour.
- The system returns to its normal operating state when the problem is over.
#1. Other Lennox Furnace Error Codes
| Lennox Furnace Error Code | Meaning | Remedy |
|---|---|---|
| E241 | This denotes that the flame sensor is faulty | The flame sensor should be cleaned |
| E292 | The inability of indoor blower motor to operate | The blower motor needs to be repaired or replaced |
| E310 | Discharge temperature sensor failure | Contact a licensed technician |
