1) Lack of Maintenance
When you think of maintenance your furnace should be something to consider. Without maintaining your heating system you could experience unexpected breakdowns and energy cost increase.
2) Clogged or Dirty Filters
How often should you change your furnace filter? The answer is once a month. Without this monthly replacement your unit will have to work much harder and will restrict the air flow.
3) Pilot or Ignition Control Problems
Along with mechanical wear and tear, your furnace’s ignition could be causing sporadic or no heat. The infrequent pilot system is also electronically controlled.
Issues with your thermostat can result in no heat, no fan to force the hot air through your home, or erratic heat.