Lennox EL296UHV E227 error means low-pressure switch open during trial for ignition or run mode. If water was still in the furnace after it stopped working, it’s likely that snow or ice has blocked the vent pipe or that the condensate drain is clogged or frozen. Luckily, there are a few ways to troubleshoot the Lennox EL296UHV E227 error and may be able to resolve the issue.
This Lennox EL296UHV E227 error does not come up very often. The EL296UHV models are different from the 2-stage furnaces that you might be used to. The inducer, gas valve, and blower all have variable capacities that work with the icomfort thermostat to learn your house and match the amount of heat you put out to how much heat is lost.
The two pressure switches are used to calibrate the inducer and provide safety in case something goes wrong with the equipment, or the flue pipes get blocked. When Lennox changed the way the pressure switch worked in EL296UHV model, it caused several furnaces to break. Some of these have had problems every now and then. There is no recall because your system is safe and would shut down if it failed completely.
Now that we know the reasons for why Lennox EL296UHV E227 error, we will learn more about what can be done to fix the problems.
- Check pressure (inches w.c.) of low-pressure switch closing on heat call.
- Measure operating pressure (inches w.c.).
- Inspect vent and combustion air inducer for correct operation and restriction.
- Check for cracked hoses.
- Check levelness of unit.
- Resumes normal operation after fault is cleared.
Other Problems Related to Lennox EL296UHV E227 Error
E223 Low-pressure switch failed open.
Check the pressure of the low-pressure switch closing on the heat call. Measure operating pressure. Inspect vent and combustion air inducer for correct operation and restriction. Resumes normal operation after fault is cleared.
E224 Low-pressure switch failed closed.
Check operation of the low-pressure switch to see if it is stuck closed on heat call longer than 150 seconds. Measure operating pressure. Inspect vent and combustion air inducer for correct operation and restriction. Resumes normal operation after fault is cleared.
E225 High-pressure switch failed open.
Check the pressure of the high-pressure switch closing on the heat call. Measure operating pressure. Inspect vent and combustion air inducer for correct operation and restriction. Resumes normal operation after fault is cleared.
E226 High-pressure switch failed closed.
Check operation of high-pressure switch closing on heat call. Measure operating pressure. Inspect vent and combustion air inducer for correct operation and restriction. Resumes normal operation after fault is cleared.
E228 Combustion air inducer calibration failure Unable to perform pressure switch calibration.
Check vent system and pressure switch wiring connections. Resumes normal operation after fault is cleared.
E229 Ignition on High Fire – Information Only
This Lennox furnace error code is displayed if a low-pressure switch fails to close, then the furnace will switch to a high-speed inducer to close both low and high-pressure switches, then the furnace lights on a high fire; if a continuous fan is active, the furnace lights on high fire for 60 seconds to improve heat exchanger warm-up time.
E240 Low flame current – Run mode.
Check micro-amperes of the flame sensor using control diagnostics or field-installed mode. Clean or replace the sensor. Measure voltage of neutral to ground to ensure good unit ground. Alert clears after the current heat call has been completed. E 241 Flame sensed out of sequence – Flame still present. Shut off-gas. Check for gas valve leak. Replace, if necessary. Alert clears when the fault is recovered.
E250 Limit switch circuit open.
Check for the proper firing rate on the furnace. Ensure there is no blockage in the heater. Check for proper airflow. If the limit is not closed within 3 minutes, the unit will go into a 1-hour soft lockout. Resumes normal operation after fault is cleared.
How to Prevent Lennox Furnace EL296UHV E227 Error
At the beginning of each heating season, your Lennox furnace should be checked as follows by a qualified service technician.
Blower
Look for dirt on the blower wheel and clean it if necessary. The blower motors are already greased so that the bearings will last longer. There is no need for any more oiling. When the blower and burners are running, the access panel for the blower must be locked in place. Gas fumes, which could have carbon monoxide in them, can get into living spaces and hurt or kill people.
Filters
All of the air filters are put outside of the unit. Every month, you should check the filters. When needed, clean or replace the filters to make sure the furnace works well.
If a high-efficiency filter is added to this system to improve the quality of the air inside, the filter must be the right size. The static pressure drop of high-efficiency filters is higher than that of standard efficiency glass/foam filters. If the pressure drop is too big, the system may not be able to do as much or as well as it could. The drop in pressure could also cause the limit switch to trip more often in the winter and the indoor coil to freeze in the summer, leading to more service calls.
Exhaust and air intake pipes
Check the exhaust and air intake pipes, as well as all the connections, to make sure they are tight and that nothing is blocking them. When there is a lot of snow, ice, or frozen fog, the furnace vent pipes can get clogged. Always check the vent system and remove any snow or ice that might be blocking the plastic intake or exhaust pipes.
Electrical
- Check all wiring for loose connections.
- Check for the correct voltage at the furnace (furnace operating).
- Check amp-draw on the blower motor.
Winterizing and Condensate Trap Care
- Turn off power to the furnace.
- Have a shallow pan ready to empty condensate water.
- Remove the clean-out cap from the condensate trap and empty the water. Inspect the trap, then reinstall the clean-out cap.
Condensate Hose Screens
Check the condensate hose screens for blockage and clean if necessary.
- Turn off power to the unit.
- Remove hoses from the cold end header box. Twist and pull screens to remove.
- Inspect screens and rinse with tap water if needed.
- Reinstall screens, reconnect hoses, and turn on the power to the unit.
Conclusion
If you’re having any of these Lennox EL296UHV E227 errors with your furnace, it might be time to call in a professional HVAC technician. Make sure you don’t have to pay a lot for furnace repairs by getting furnace maintenance. Having your system inspected periodically can prevent a minor repair from becoming a major endeavor.
