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I finally understand the history of the temperature sensors of my in-floor heating.

When we moved in, the wire to the Pt1000 thermistor in the bathroom was disconnected, causing it to read 400C. After 5 repair appointments, it was only disconnecting sometimes. I jiggled all the connections and it stopped disconnecting.

But now it read about 12C all the time. I figured there was still a wiring issue and bought a multimeter (my US multimeter got left behind).