Is it set below the present house temperature in the house? If so, raise the setting above present house temperature.
Is it in “on” position.
Look for a blown fuse, or a tripped breaker. If a fuse is blown, replace with fuse with correct amperage. If a breaker is tripped then reset the breaker.
Press it only ONCE… (maybe located on the furnace or on the chimney pipe or on the oil burner.)
If you hear a “hum” and burner has not started, press the overload button on the motor.
To ensure your tank is not empty.
FOR SERVICE TO YOUR HEATING SYSTEM PLEASE CALL 519-357-2664 or 1-800-265-3069