HWDiffers standby error EPower 250A unit

Could HWDiffers warning make EPower power controller unable to firing? We are not able to remove this warning, what could be a problem? We are using only single phase on some resistance (heater). But we do not get any power on it. Pins 8 and 9 are shortened. We use Analog1 Input providing 0-10 V voltage for controlling the power. We would be very happy to get any power on resistance.
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