My XE 80 gas furnace stopped working today. At first I had the diagnostic LED blinking 4 times indicating and open high limit device failure. I played around with one of the temp sensor and got the code to go away. I know get normal call for heat and the burner ignites. But the blower will not run, not even it I set the thermostat from auto to fan. it i kill the main power to the furnace for a couple of hours then power it back on it work fine for a couple of days.
i had a tech out and he said it is very dirty inside the blower, so he cleaned it and cleaned all the sensors.
a week later same problem. called tech back again . this time he said it is the motor capacitor it reads 4 mf instead of 5mf. installed new capacitor.
a week later same problem. is it the fan motor?? is this common ? unit is only 10 yr old.