HAKO Scrubmaster B 120 R Service Booklet page 24

2.2.4 Seat contact switch (3.6.6.4.)
To reactivate the machine after triggering "seat switch manipulation", the machine
control unit must "register" the change of the switch status or the change between
'operator is sitting on the machine' and 'operator has left the seat'.
To achieve this, the seat contact switch must be opened and closed several times
while the machine is on.
A seat contact switch that has been detected as being "open" by the machine (no
operator on the seat) is indicated on the display of the control panel via the flashing
hour indicator and the operator symbol. If the seat contact switch has been detected
as being "closed", i.e. an operator is on the seat, the hour indicator in the control panel
is permanently on and the operator symbol goes out.
'Seat contact switch closed' means there is an operator on the seat;
Seat contact switch 'open' means there is no operator on the seat.
Sheet 24