The air filter is responsible for protecting your furnace from dust and debris that blows in from the ducts. Though it does this job well, the filter has no way to rid itself of any particles that it collects. If not cleaned or changed out every 1-3 months, the air filter can become clogged. This restricts the air flow through the system, trapping heat inside the furnace and causing it to overheat. When this happens, it trips a device called the “limit switch,” which shuts the furnace down as a safety measure. If your furnace suddenly shuts down and won’t restart, it is possible that it overheated due to a dirty air filter. If you replace your dirty air filter, that might be all that is needed to solve the problem.
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