Performed diagnostic on 14yr old Rheem unit, upon arrival customer stated unit wasn’t heating this morning , stated when it finally did come on it ran for maybe 5/10 min then would shut off, checked tstat, recommend replacing tstat , cycled to heat mode, unit started up, checked filter, burners, flame sensor, blower wheel, inducer motor, found inducer over amping, recommend replacing, after about 7minnunitnwoukd shut off and give code high limit activated, inspected heat exchangers, used monometer to check heat exchanger tubing , once I turned on fan monometer starting readin, .07, indicating air was coming inside heat exchanger, upon going over repairs customer stated he didn’t wanna make repairs due to age , scheduled install supervisor for today