Damage to geothermal boreholes has recently been caused by unprofessional work during the construction of geothermal probes or due to difficult geological and hydrogeological conditions.

If the grouting material is used professionally, unfavourable geological conditions can be compensated under certain circumstances (e.g. safe closure of a borehole in which pressurised groundwater rises to the surface).

There are, however, geological conditions in which the construction of geothermal probes should generally be avoided. If problems occur during the construction phase, a balance must be achieved so as to check whether these can be controlled with professional technology or whether drilling must be stopped. The decision on this is made by the approval authority.