The furnace will not start. It gives a 33 code. What does this mean?Post created: 2016-06-25 Type of Equipment: Furnace Views: 68
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On 2016-07-01 Gary wrote:
This is a problem with a limit switch. A lack of air flow, probably from your filter, is causing the switch to trip. You can try changing the filter, and make sure that there is no obstruction in your vents.
If this does not solve your problem and you'd like to have a contractor take a look at your furnace, we can help you find one, here.