There are three areas you want to pay attention to when it comes to furnace maintenance. They are the furnace filters, the blower and the motor.
A typical furnace -
• check the operation of burner
• inspect the heat exchanger
• check the blower operation (clean if needed)
• check the amperage (oil if needed)
• check the fan belt
• check the condensate drain
• check the condensate drain wiring
• inspect the wiring for cracks or loose connections visually inspect the heat exchanger for cracks
• check the calibration and operation of limit controls (limit switch, pressure switch and roll out switch)
• check the fan limit, check the high limits
• check the thermostat calibration and anticipator
• check the operation of the ventor
• check for carbon monoxide near the furnace and throughout the house.
