What are the common Lennox problems?

Common Lennox problems reported by homeowners and HVAC technicians include issues that are typical for many furnace and air conditioner brands but with some specific patterns for Lennox models. For Lennox furnaces, common problems include ignition failures with hot surface ignitors that wear out every 3 to 5 years and need replacement, flame sensor issues where dirty flame sensors cause furnace to shut off shortly after starting, pressure switch failures that prevent furnace from starting due to blocked venting or failed switch, and blower motor failures in older models. For Lennox air conditioners, common problems include evaporator coil leaks that were subject to class action settlements in the 2010s where some coils developed leaks due to formicary corrosion, refrigerant leaks requiring recharging, capacitor failures that prevent compressor or fan from starting, and frozen evaporator coils due to dirty filters or low refrigerant. Some older Lennox Pulse furnaces from the 1980s had heat exchanger issues and were subject to recalls. Overall, Lennox is considered reliable but like all HVAC equipment, it requires annual maintenance, filter changes, and occasional repairs of wear parts like ignitors and capacitors that typically cost 150 to 400 dollars to fix by an authorized Lennox dealer.