10 Common Furnace Problems - AAA Heating Cooling
7. The furnace doesn’t heat enough. In addition to a clogged filter, a furnace may not produce enough heat if it’s the wrong size for the space. 8. Frequent cycling. Cycling between the “On” and “Off” modes may indicate a clogged filter, improper airflow or a bad thermostat setting. 9. The blower continuously runs.
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