turn the power source off for 5 to 10 minutes. and reboot , if it fails to run try again, if problem persists call a pro.
It tells the furnace that it lit... Hence the name Flame Sensor.
check your flame sensor
If the furnace is direct ignition, The HSI or spark ignites the flame. A flame sensor passes current through the flame, if current is present the main.
flame sensor
A flame sensor is a safety mechanism installed on gas furnaces. It is located directly between the burners and the gas supply. When your gas kicks on, the flame sensor MUST detect a flame. This safety mechanism is to prevent your house from filling up with un-lit gas. Even if your burners are igniting, if your Flame Sensor is dirty (covered in carbon from typical use) it will fault out, thus shutting off the furnace over and over. If this is the case, your furnace will kick on every 2 minutes (because the thermostat tells it your house is too cold) and then will shut off after 5 or 10 seconds as a result of the Flame Sensor Fault.
AC voltage(at least 90vac) pass through the flame sensor and the ionization of the flame creates or rectifies the voltage to DC and a small microamp that can be measured with a meterl.
Probably the flame sensor.
Could be a bad computer board or flame sensor. If you have to keep resetting it-the computer board is more likely the problem.
Changing Filters monthly or bimonthly, Cleaning the Flame Sensor yearly or bi-yearly, and getting a yearly maintenance/tune-up from your dealer are good suggestions on how to maintain a furnace.
Its not a flamesensor its a pilot generater it generates a small amound of electricity to open the main valve that way if your pilot light goes out it wont let gas escape and couse a potentian explosion The above answer is not accurate unless you have a standing pilot model furnace. Then the "flame sensor is called a thermocouple, much different than the flame sensors used in Direct Spark Ignition, hot-surface and intermitant ignition furnaces. The flame sensor uses the flame of the main burner to prove flame at the circuit board by measuring conductivity to ground through the flame.
Is there a flame in the furnace. Precisely where is this air coming from and how strong is it?
its hot!