A larger fuse should cure the problem, but that can't be guaranteed since we don't know why the original fuse is blowing.
So start with the fuse - it will cost you less than a buck.
If that doesn't work, pull out the pump motor and make sure the pump chamber and rotor aren't full of guck which is binding up the rotor. Pulling the pump motor is easy. Just remove the two big Phillips screws on the top of the back of the toilet, and lift off the cover. The pump is the rubber-encased black cylinder. As you pull it out, make sure you don't lose the white nylon block that connects the motor shaft to the pump shaft. Once you have the motor out, you can use a flashlight to peer down into the pump enclosure - maybe even shoot a strong jet of water down it to clear any clogs. Run the pump motor while it is out of the toilet, and again when you reinsert it.
Buying a new pump should be your last resort. Not only is it expensive, but it means disassembling the toilet one more level.
The model 80 is the only Thetford recirculating toilet.
Bill
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