Started up normally the first time, however on subsequent starts it smokes badly and errors out. It will start after being reset and eventually runs fine after warming up. NOTE THE FOLLOWING. I have an extra long exhaust and my installation is abnormal in many ways. I suspect that the smoking is due to my own skulduggery which is NOT the fault of the equipment. My 4 star is only because the instructions are really minimal. At $90.00 I may order a second one just to see how it works and for parts.