...every evening so it runs overnight and ready to go the following morning. Per this video, the problem is there are a lot of simple error codes that will shuts down the machine until a Taylor repair man can reset it. He said a lot of the time the hopper was just too full, and the heating cycle of the cleaner can't bring the temp of the mixture up to whatever it requires. It might be one degree below the limit, and lock up the machine. He said having a slightly lower amount of ice cream mix in the hopper might not trip that error. The error codes are cryptic, and the stores aren't allowed to have the service manual to decipher and fix it themselves.

Other fast food restaurants have (other model) Taylor ice cream machines, but they only fail ~1% of the time instead of the 13% failure rate in McDonalds' Taylor machines. The reason is their franchise owners aren't required to buy the model that McDonalds uses...lol