I found your thread while I was searching to see if anyone else has had as many problems with their Mr. Heater. I installed my garage heater, MHU45, in Jan. of '07 and have had nothing but problems and downtime. I've also found the customer service has little to desire. The circuit board had to be replaced right away. The heater would not ignite and after several attempts, got through to customer service to get the board sent to me (covered under the one year warranty). Still, the heater would only work if the cover was kept off. Then the fan blade broke away from the collar piece it attaches to. This time I could not get customer service to help me (transferred from dept. to dept., had to leave voicemails, and never did get a response). Then my warranty expired. Currently, it won't ignite, again. I truly regret buying a Mr. Heater hanging furnace. These should be good heaters (the competitors have great reputations: Reznor, Hot Dawg, Beacon Morris), but the parts are obviously inferior. BUYER BEWARE!!!