Help! We have a 2007 Class C Winnebago Access. Our furnace worked fine one night, then didn't work the next night. The blower comes on for about 30 seconds, then shuts off; we don't hear any clicking sound like it's even trying to light. The furnace is now sitting on our garage floor--any ideas? Luckily, we had lots of blankets along since it was 42 degrees in the morning!