...Thermostat, fan speed options: ON = fan is always on AUTO = Fan runs when heating or cooling system is on CIRC = Fan runs randomly, about 35% of the time, while heating or cooling system is not ...
...circ fan. Your are either having a problem with fuel flow or the igniter. Feel around the two red wires when you try to start the heater. If they get hot you have a fuel problem. If you also hear a ...
...Your furnace may be kicking out on high limit. Its possible your circ. or blower fan needs to be cleaned. If you don't get enough air moving across you heat exchanger it will kick off on high
...circ fan kicks in on high, the air intake fan RPM also increases which may allow it to get enough combustion air to make this noise go away. If this is right, you will need to install a fuel pressure ...
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