A licensed professional service technician (or equivalent) should inspect the complete system each season (heating and cooling). The following maintenance procedures should only be conducted by a licensed professional service technician (or equivalent). D
WARNING: ELECTRICAL SHOCK, FIRE, OR EXPLOSION HAZARD. Failure to follow safety warnings exactly could result in dangerous operation, serious injury, death or property damage. Improper servicing could result in dangerous operation, serious injury, death, o
WARNING: Asphyxiation Hazard The exhaust vent for this furnace must be leak−free and must be securely connected to the furnace flue collar at all times. For your safety and to fulfill the terms of the limited warranty, a licensed professional service tech
Annually (before heating season) inspect furnace venting system, vent cap, heat exchanger, and burners for corrosion, deterioration, or deposits of debris. Remove any obstructions.
WARNING: The blower access panel must be securely in place when the blower and burners are operating. Gas fumes, which could contain carbon monoxide, can be drawn into living space resulting in personal injury or death.
CAUTION: To ensure proper operation, a licensed professional service technician (or equivalent) should check the burner flame and conduct a combustion analysis annually.
Call your Lennox service technician if the unit will not operate. Before calling, always check the following to be sure service is required:
Record the model and serial number of the furnace. These numbers are on the unit nameplate, which is located on the blower deck below the combustion air inducer.
You should expect a service technician to check the following items during an annual inspection. Power to the unit must be shut off for the service technician’s safety.
Fresh air grilles and louvers (on the unit and in the room where the furnace is installed)
Must be inspected for
Blower access door
Return air duct
Pay attention to your furnace
Repair Parts List
The following repair parts are available through Lennox dealers. When ordering parts, include the complete furnace model number listed on the CSA International nameplate −− Example: ML193UH045P36B. All service must be done by a licensed professional insta
Control Panel Parts