Eutotherm 2604 Err2 and Conf problem

Hi, we have a problem with Eutotherm 2604 controller. When turning on it cyclically reboots and shows "Err2" on display. After some time (some minutes) it started to work, but we see Config Access level, where we can not change the Num of Loops parameter (0) and set the required communication protocol.
How can we fix this problem, and what is the reason?
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