Regulator Eurotherm 2604 problem

Hello,

I write to you from Dacia Romania.
We have some problems with two Eurotherm 2604 regulators that we recently changed.
In manual all is fine (opening and closing commands of the valve are working). When we switch to auto, the opening command it’s working, but when we reach the prescribed value the closing command it’s not active, the regulator remain open and the temperature continues to rise. No error message on the Eurotherm.
The transfer of the application in the Eurotherm is done without error.
The only difference between the old and the new regulator is the firmware version. Perhaps this can be the problem?
Old SN : RD026835U300
New SN : RD029402U401

Thanks in advance for your help!

Best regards,
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