I have a Huber immersion cooler and the display is reading error F1-. How can I fix it?

The immersion cooler models with an MPC control panel (shown below) require an external Pt100 temperature probe to operate.

huber immersion cooler mpc controller f1 error and pt100 socket

These models are supplied with a Pt100, so plug this in to the socket (below the display), and the error message should stop.