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Heating & Cooling Maintenance, Repair & Troubleshooting FAQ from NortherHeat
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
