We have three type K TCs connected to an F2-04THM module. Thermocouples are reading 400-500 degrees low on the PLC input as compared to what they read with a TC calibrator. We have verified all jumper settings on the card and ladder logic in the PLC. TC extension cable is correct. The TC connections are difficult to get to - we have not verified but all readings are stable on either the PLC or the calibrator. We believe actual temp is approx. 1300 deg, PLC reads 1800 +/- for all 3 TCs. Has anyone encountered this issue on this card before?