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Check out these tips and explanations, below, from our Heating and Cooling Expert. Of course, you're also welcome to post questions to this board for more information: Just click the "Ask about Heating & Air Contidioning" button at the top of the page.
Fuses protect wiring and components from receiving to many amps or power.
High voltage fuses can be in a breaker box or fuse panel.
They can also be located on the side of the furnace by the switch that looks like a light switch, typically called an SSU.
Low voltage fuses can be on the circuit board or in what is called a fuse holder.
Fuse holders are typically found in the 24 volt wire leading from the transformer. Note... Many digital thermostats also have a fuse in them.
When a fuse blows, quite often, there is a reason. Either a wire has short circuited to ground or a component has failed.
Roll out limit.
This is just one example of many. However, all roll out limits must be manually reset.
Purpose: Safety device.
These limits trip if flames ever roll out of the heat exchanger, or flames burn where they are not supposed to be.
If a roll out trips the potential of having a major problem with the burners are high and a service tech should probably be called to diagnose the problem.
Linear Mode
