When your oil furnace doesn’t start, press the reset button to start the furnace manually.
The reset button is located on the primary control’s stack for older models, while for newer models, it is on the burner motor.
The reset function loads fuel into the combustion chamber. If the furnace doesn’t come and stay on within a minute of pressing the reset button, check the fuses or the circuit breaker. If the circuit breaker is on, then the problem could be with the HVAC system’s wiring or the fuse. When the burner runs, and there is no fire, there could be a problem with the burner nozzle. The burner nozzle has an opening smaller than the tip of a needle and the opening. A negligible amount of water or dirt clogs the opening. Replace the nozzle to restore the furnace to a working state. The presence of water in the oil will cause the burner to stop working. To fix this, you have to disconnect the supply line from the burner system, drain the oil into a clear jar, hold it to the light, and look if water is present. Another oil furnace problem is insufficient heat coming from the registers, which results from blocked air filters, broken fan belts, or problems with the ductwork. Examine the filters for clogs due to dirt. If the filter is clean, inspect the fan belt and air supply fan to determine if they need replacement. Check if your ductwork is leaking. Typically, an HVAC system’s ductwork degrades with time. If it is corroded, repair it using duct tape, silicone glue, or metal duct tape. Check the power supply and low battery signal in your thermostat. Replace the batteries on the thermostat if it is low. If nothing shows on the screen, your HVAC equipment has a faulty thermostat or a power supply problem. Call an HVAC technician for help.