Despite the indispensable preventive maintenance, it is not possible to guarantee that the lift system will be completely free from faults, which must be repaired in order to restore correct operating and safety conditions. On average, Koppel lifts are affected by less than 2 faults per year, although in specific cases this frequency depends on local environmental conditions, usage, the age of the system, and so on.
Certain faults cause the system to stop while the cabin is occupied, so that the passengers are trapped, in this case it is necessary to call the emergency services (see below).
With the exception of such urgent situations, systems are normally repaired within a day, and the average down time for a Koppel lift in the event of a fault is approximately four hours.
Taking into account the brief interruptions for preventive maintenance, Koppel lifts are in service for 99.8% of the year.
Normal market preference is for simple or ordinary contracts that only cover preventive maintenance costs, so that work carried out to repair faults, labour and spare parts are paid separately.
The parties may also draw up all-inclusive contracts, or intermediate solutions, which include all or part of any corrective maintenance costs.
Naturally, operating faults are not necessarily comparable with accidents, which, thanks to the thorough checks that are carried out on lift systems, are very rare.
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