When the blower motor run all the time, that mean you have a safety limit tripped. One of the limit is located on top of the burner, to reset that all you have to do is press down on a little tap that sticking up in the middle of the switch. The second switch is located at the flute pipe, to reset the switch is the same procedure. The third limit switch is located on the heat exchanger box itself, this one cannot be reset, you will need an ohm meter to check for contunuity. Set meter to ohm function, if the meter read nothing then the switch is bad. Good luck.
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When the blower motor run all the time, that mean you have a safety limit tripped. One of the limit is located on top of the burner, to reset that all you have to do is press down on a little tap that sticking up in the middle of the switch. The second switch is located at the flute pipe, to reset the switch is the same procedure. The third limit switch is located on the heat exchanger box itself, this one cannot be reset, you will need an ohm meter to check for contunuity. Set meter to ohm function, if the meter read nothing then the switch is bad. Good luck.