Q:

How do you troubleshoot a Lennox HVAC system?

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Quick Answer

The process of troubleshooting a Lennox HVAC system includes inspecting the thermostat, blower motor and electrical wiring to ensure proper operation. Troubleshooting a Lennox air conditioner involves checking the refrigerant, compressor, expansion valve and evaporator coil, while issues with the pilot light, limit control or flame sensor are all common furnace problems. The assistance of a professionally qualified service technician is often necessary to identify and address certain HVAC issues.

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Full Answer

Furnaces built after 1990 typically have a small window-display light that indicates whether the system has power. This light may flash a code that provides useful information when troubleshooting a problem. To trigger the light, turn the system off and then back on before noting the sequence the light is flashing. The key for deciphering furnace codes is commonly found on the inside of the access panel.

Improper thermostat settings and low levels of refrigerant are the most common problems that affect air conditioning systems. Reduced levels of refrigerant may indicate a leak that needs to be identified and repaired. Inspecting the exterior fan, changing the air filter and ensuring coils have not become frozen are all useful steps when troubleshooting an air conditioning issue. Issues caused by faulty wiring can pose a potential fire hazard and improper furnace operation may result in a carbon monoxide leak.

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