Safety Precautions
If you discover any of the following, shut down your unit, and contact a Lennox dealer for an inspection by a licensed professional service technician (or equiva- lent).
D If you repeatedly hear any new or unfamiliar sounds while your unit is operating, there may be a problem. For example, poorly performing burners can produce unfa- miliar noises.
DIf you smell any unusual odors, your unit may be operat- ing improperly. For example, units can give off unfamil- iar odors if components are required to operate in ab- normal conditions.
DLook for visible signs of a malfunctioning unit. Examples include unusual amounts of condensate on windows in- side your house, visibly burnt components or unusual dirt or rust accumulations on the vent pipe or in the unit.
DIf you experience headache, nausea, fatigue, or dizzi- ness, the cause could be exposure to carbon monoxide gas. This is often misdiagnosed as the flu because symptoms are similar. If you suffer from flu−like symp- toms that are exaggerated at home, but seem to sub- side while you are away from the house, exposure to carbon monoxide could be the cause.
Your vigilance may pay off in early detection of a problem before either personal injury or property damage occurs. Do not hesitate to contact a licensed professional service technician (or equivalent) as an investment in your well be- ing.
Planned Service
You should expect a service technician to check the follow-
ing 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 open and unob- structed to provide combustion air.
Burners − Must be inspected for rust, dirt, or signs of water.
Vent pipe − Must be inspected for signs of water, damaged or sagging pipe, or disconnected joints.
Unit appearance − Must be inspected for rust, dirt, signs of water, burnt or damaged wires, or components.
Blower access door − Must be properly in place and pro- vide a seal between the return air and the room where the furnace is installed.
Return air duct − Must be properly attached and provide an air seal to the unit.
Operating performance − Unit must be observed during operation to monitor proper performance of the unit and the vent system.
Combustion gases − Flue products must be analyzed and compared to the unit specifications.
Problems detected during the inspection may make it nec- essary to temporarily shut down the furnace until the items can be repaired or replaced.
Pay attention to your furnace. Situations can arise be- tween annual furnace inspections that may result in unsafe operation.
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: G71MPP−36B−070−1. All service must be done by a li- censed professional installer (or equivalent), a service agency, or the gas supplier.
Cabinet Parts
Upper access panel
Blower access panel
Top Cap
Control Panel Parts
Transformer
SureLight® integrated control Door interlock switch Circuit Breaker
Blower Parts Blower wheel Motor
Blower housing cut−off plate
Heating Parts
Flame Sensor
Heat exchanger assembly Gas manifold Combustion air inducer Gas valve
Main burner cluster Main burner orifices Pressure switches Ignitor
Primary limit control Secondary limit Flame rollout switches Backup secondary limit H−fitting assembly
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