I am in great need of information.recently, my lennox rooftop" heating sysrem was condemed.the building has not been inspected for 12 years.(date on heaters)units were condemed by the building inspector.three (3) cracked heat exchangers.I sighned my lease on nov.21.02 the units were condemed on feb 22,2003.the owner of the building evicted me for the amounts of all 3 heaters. please e-mail ant information you may have on these units. canon suplly states they fixed a switch on one unit, it worked so no need to go futher. please help me.