Back UPS RS 1500 LCD fan runs continuously

[Anonymous user]

Today, my wife woke up her Macbook Pro and the attached Thunderbolt display and the fan came on.  There was no power failure and the number of events was 0. Only when I unplugged the unit and turned it on its side to access the battery compartment did the fan stop.  Any suggestions?

[Anonymous user · Accepted solution]

In fact, after turning off the power switch and unplugging the UPS, the fan still ran for 30 seconds before stopping, with nothing plugged into it!