It could be a couple of things:
1. Wha is the condition of the pilot light? Does it have a yellow or white color to it? If so it will need to be cleaned. It could also be buring with to much pressure and blowing itself out.
2. What is the thermocouple connected to? If it is a silver color box (and not directly the gas valve) it could be weak and need repllacing.
3. If it is connected to the gas valve, that could be your problem as well, but it is an expensive replacment item.
4. Is there a down draft coming from the chimney? Air blowing down the chimney that does not have a cap on it can also cause the pilot to blow out.
Did you purge the air out of the gas line? This could cause the problem by air being introduced into the line.
The pressure switch that tells the furnace the vent fan has started and is running properly, did not close. Try tapping it lightly with a finger once the fan has started, then get it replaced. Follow the rubber hose from the vent fan to locate the pressure switch.
Not really, there's not much airflow when the furnace is not running.
When you say the furnace is still running, I take that to mean the fan and not the actual flame portion of the furnace. If this is correct, you either have a fan relay that is sticking closed or your tstat is bad. == == == == There may be a very slight time delay the the thermostat before turning off the furnace, but if you are sure that you have turned the thermostat off and the fire continues to burn, you have a serious problem. Have it checked out. The gas valve may be sticking in the open position. Regards
yes it can fan
sounds like a fuel problem change the fuel filter first
Just had this problem. I replaced the oxygen sensor and it appears to be running fine.
mine did that and i replaced the crank shaft sensor,problem was fixed
Try getting the PCV pipe replaced. Mine had a problem with it conking-out at stops and on turns and that turned-out to be the problem. It could also be a vacuum leak.
If the heater blower has humming noise when motor is running, first check its capacitor. If the capacitor is fine, then the motor is the problem and may need to be replaced.
With central air the furnace fan must be running to provide the air to the living space. If the furnace fan is not running then you get no air out of the ducts and the A-coil (the part of the ac system that is in your furnace duct) will freeze and shut down the compressor (the part that is outside).
Perhaps plugged radiator - have it boiled out or replaced