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Lennox G16Q3 gas furnace operation and troubleshoot
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This furnace is an adaptation of an earlier model that was draft hood equipped.
This model replaced the draft hood with an inducer fan. The furnace is essentially similar to the conventional gas furnace with a pilot light system. The only changes are the inducer and an electronic ignition system. Below is a video covering troubleshoot of the inducer. |
The heat exchanger of this furnace is interesting in its design and was called "the curve". This heat exchanger was known for cracks. The video below covers how to inspect for cracks.
This furnaces uses an electronic ignition that starts by turning on gas to the pilot light and also starts a spark to light the pilot. When the pilot lights, there is a proving system that insures that the pilot has lit. Then it allows main gas to come on.
In this case, the main gas valve is stuck on so when the pilot valve opens, so does the main gas. This is dangerous because if the spark fails, the unburned gas will be dumped into the furnace and could cause an explosion.
The video below explains what has happened.
In this case, the main gas valve is stuck on so when the pilot valve opens, so does the main gas. This is dangerous because if the spark fails, the unburned gas will be dumped into the furnace and could cause an explosion.
The video below explains what has happened.