Possible trouble:
The unregulated intermediate circuit voltage is outside +200V to +320V.
Possible help:
- Check voltage Uz on board D1.
- Measuring divider: 50 V corresponds to 1 V line voltage
- wrongly programmed on transformer T1.
- Check fuse D2/F1 and D2/F2.
- D1 defective.
- D2 defective.