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hi i am dan i can help you with this. that error code means the high limit switch is open and that is why it is not letting the burner come on. can you locate the high limit switch in the furnace?
the best way to check it is with the power on and testing voltage. you should read 0 volts across it and 24 volts from one terminal to ground.
no that is the roll out switch. it may be tripped instead if you push that button in that will reset it and see if that works. if not it is the high limit switch that will have 2 wires coming from it and be mounted on the plate of the furnace sticking inside it. if you can take a picture of the furnace with the components and post it here i can help you locate it and test it easier.
yes that is the high limit switch. did you check the voltage reading across those 2 terminals?
ok next step is to check the volt reading across the 2 terminals of that switch. you should have 24 volts from one terminal to ground and 0 volts between the 2 terminals if the switch is good. to double check you can remove the wires and check the continuity too.
let me know when you check that.
there may be another limit switch located on the blower housing probally in the back.