Where is the flame sensor in a Lennox furnace?

Where is the flame sensor in a Lennox furnace?

Look for a thin metal rod on the left side of the burner assembly; this is the flame sensor. Remove the screw that holds the flame sensor rod in place.

How do you clean a Lennox high efficiency furnace?

Remove dirt and dust

1. Inspect the burner flames.
2. Vacuum out the burner and blower cavities and clean away dust or debris in and around the unit.
3. Remove the blower to clean it.
4. Vacuum and brush the blower blades.
5. Clean the flame sensor.
6. Check the flue for gaps or dents and make sure it is venting properly to the outdoors.

Where is the flame sensor located?

burner assembly
A furnace flame sensor is a very basic part of your furnace. It’s located on the burner assembly and is just a thin metallic rod. It’s usually bent, and it sits just in front of the pilot flame inside the furnace.

How often should a flame sensor be cleaned?

Generally speaking, the flame sensor should be replaced every two to three years as preventative maintenance. Some technicians also recommend changing it any time that there is a flame current issue.

How do I know if my furnace flame sensor is bad?

How do I know if my furnace flame sensor is bad?

1. Switch off the power to your furnace.
2. Close the gas valve.
3. Take out the mounting screw.
4. Carefully pull out the sensor.
5. Inspect the sensor: if the insulation is intact but appears sooty, burnt or slightly corroded, it might only require cleaning.

What are the symptoms of a bad flame sensor?

How to know if you have a bad flame sensor is quite easy to diagnose. Signs of a bad furnace flame sensor are: The furnace lights but then shuts down after a few seconds (short cycles) The porcelain on the flame sensor is cracked.

How does a flame sensor work in a furnace?

A furnace flame sensor works by detecting the presence of a flame within the furnace. The sensor is a short length of thin metallic rod that creates a small current of electricity in order to confirm there is fire burning within the furnace.

Why does my furnace flame go out?

The usual cause of flame rollout is that the draft through the furnace is impaired in some way. Normally, a current of air enter the furnace through the burner area, then carries the combustion gasses through the heat exchanger, into the vent out out the the vent cap/chimney.