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Eurotherm 2408 Loop break (L.br)

Hi!

I have an Eurotherm 2408 and want it to use as a heating controller. It has a thermocouple (type K) connected at V+ and V-. The power supply of the heating coil needs 0-5V to control it and it's connected at 1A and 1B.
If the eurotherm now should heat I get the error "L.br" which according to the manual means an open circuit. The power supply has an input impedance of about 1 megohm. So I guess the Eurotherm is mistaking this for an open circuit? What can I do?

Thanks for the help!
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