System intermittently Heating Lennox system located on lower level. System is 17 years old and has multiple worn/weak components. Could not get system to lock out while on site. The blower starter is reading .4 out of 5 and the blower motor is very slow to start up. This can cause the system to over heat and trip the high limit safely device in the system. I recommended replacing this component and also recommended updating the equipment due to its age and condition. At this time the homeowner wanted to replace the blower starter and hold off on replacing the system. After replacing the starter I tested the system. System is working to its best ability given the age and condition. Thank you for choosing T.E. Certified, have a great weekend!