Fantastic Fan blowing fuses

Has Atwood called you back? It's now been 4 days. That's a long time to wait for tech support.

Did the fan ever run properly? Does the dome open properly? A bit more information would help. Do you have a fan speed switch or is it thermostatically controlled. If you have a speed switch have you tried different fan speeds?

The control board in the fan operates the lift motor. When the lift motor gets to its maximum range, either closed or open, the control board senses the current increase because the motor stalls and shuts the lift motor off. If your dome lid is stuck, the control board should try to activate the lift motor and when the dome does not move it senses a current increase because the motor is stalling and shuts down the motor. A switch under the dome turns the fan on or off when the dome is about 25% open. The fan will come on before the dome gets fully open and will shut down before the dome gets completely closed.

You don't say if the dome lift is working or not. I assume it is or your post would have been different.

If the fan starts turning but then blows the fuse I would suspect a short in the fan motor and a new motor would be required. But, make sure you have a good 12 volt supply to the fan.

My model is the basic manual version with a hand wheel for opening the cover. As the cover raises the fan goes on. It has 3 speed settings, but we always leave it on 1. The fan has worked for almost 4 years now, we bought it in Oct 09. We have 2 other FF automatics with rain sensors and they continue to work fine after almost 8 years, and they are run a lot.

The other day when I opened it didn't start. I checked the fuse and it was blown. I put in a new one and when I opened the cover the fan began to turn slowly and then stopped. The fuse was blown again. Did this 3 more times at different speed settings with the same result. I can spin the fan without power and it seems to spin easily. I'm figuring the motor is shorted, so we just ordered a new one from Camping World, they have it on sale now for $94. I think it's worthwhile just swapping it out for new rather than trying to take it all apart. I'm getting a little too old and feeble to be on and off the roof too much.
Thanks for all the comments and suggestions,
Fred

KATOOM wrote:
That doesn't sound like you called http://www.fantasticvent.com/. They have impeccable customer service and will replace whatever you need.

Sadly, that is now a "WUZ" or as the indomitable Inspector Clouseau would say..

"Not Any More"

You need to measure amperage at the fan. Mine uses a max of around 3 amperes so most any digital or analog multimeter with a 10 amp capacity will work.

3-in-1 oil works great as a lubricant. Let time and gravity be your ally. Remove the fan, stand it up so the oil runs down into the bushing and give it a drop. Revolve the blades a few times. When that bushing frees-up flip the fan over and do the opposite bushing. Should last many years. This can take a couple of days allowing the oil to creep slowly down into the bushings.