Karcher B 250 R I Bp: Troubleshooting

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10

1 Bowden cable

2 Screw of the link bracket

3 Link

4 Cover

5 Lid screws



Hang out the Bowden cable.



Loosen and remove screws of the link 

bracket.



Remove the crank. 



Loosen and remove both screws of the 

lid and open the cover. 



Pull out roller brush.



Insert new roller brush and reassemble 

the sweeper in the reverse sequence.



Readjust the Bowden cable.

In case of danger of frost:



Empty the fresh and dirt water reser-

voirs.



Store the appliance in a frost-protected 

room.



DANGER

Risk of injury. Before carrying out any tasks 

on the machine, set the main key to "0" and 

remove it.  Press emergency-stop button.

Suction turbine, side brushes and filter 

cleaner continue to run for a while after 

switching off. Carry out maintenance tasks 

only after these components have come to 

a halt.



Drain and dispose of the dirt water and 

the residual fresh water.

In case of faults that cannot be remedied 

using the table below please contact the 

customer service. 

The operator may only replace the follow-

ing vehicle flat fuses having the following 

values: 

– 7.5A (F1) – Control and emergency 

power supply.

– 30A (F3) – Lift/accessories module sup-

ply.

– 80A (F6) – Lift/Clean module 2 (sweeper).

ATTENTION

Defective pole fuses should only be re-

placed by the service center. If these fuses 

are defective, then customer service center 

has to check the usage conditions and the 

entire control system.

The control unit is located below the oper-

ating panel. To access the fuses the cover 

on the left side of the foot compartment 

must be removed in advance.



Turn out the fastening screws at the up-

per end of the cover. 



Remove cover. 



Replace fuse.



Replace cover. 

Note:

The population of fuses is displayed on the 

inner side of the cover. 

The display shows the existing faults at in-

tervals of 4 seconds (example:

Fault scrubbing

funktion H1/022

If the faults continue to be displayed on the 

console even after 4 seconds, then pro-

ceed as follows: 



Bring the key switch to "0" (switch off 

the machine).



Wait till the text on the display has dis-

appeared. 



Bring the key switch back to "1" (switch 

on the machine). Carry out the trouble-

shooting measures in the given se-

quence only if the fault occurs again. At 

such times, always bring the main 

switch to the "0" position and ensure 

that the emergency-stop button is de-

pressed.



If the fault cannot be repaired, call cus-

tomer service and mention the fault 

code(s) (H1/022 in the example). 

Frost protection

Troubleshooting

Replace fuses

Fault indication

Faults with display

Display

Cause

Remedy

Seat switch broken seat switch open

Seat contact switch has not been 

activated. 

The machine only operates if the operator is seated on the 

seat. Plug in the plug of the seat contact switch.

Release accelera-

tor!

release throttle?

The gas pedal is depressed when 

the main switch is on.

Take your foot off the accelerator before switching on the 

main switch. If the fault recurs, call customer service.

battery empty -> 

charge!

battery empty -> 

charge!

The discharge level of the battery 

has been reached. Cleaning units 

can no longer be operated. Drives 

and lighting can be activated. 

Drive the machine to the charging station and charge the 

battery. 

battery totally dis-

charged!

battery totally dis-

charged!

More than the permissible battery 

capacity has been utilised. All 

units will be switched off. Machine 

is no longer ready for operations. 

Manually unlock the front wheel brake. (Caution! The appli-

ance does not have any braking effect now!) If unlocking is 

not possible, then call customer service. Move the machine 

slowly to the charging station. Charge battery.

Dirt reservoir full, 

cleaning stopped

sewage tank full 

cleaning stops

Dirt water reservoir is full.

Empty the dirt water reservoir.

Operating hours set 

to 0!

operating hours set 

to 0!

Internal machine error while sav-

ing the number of operating 

hours. During restart, the operat-

ing hours are always reset to 0. 

None, for information.

Module tempera-

ture high! Let cool 

down!

moduletemp. high 

let cool down!

Controls are too hot. 

Set the key switch to "0". Wait at least 15 minutes. Set the 

key switch to "1".

Drive motor hot! Let 

it cool down!

drive motor hot! let 

cool down!

Drive motor has got overheated 

due to a steep climb or locked 

brake. 

Set the key switch to "0". Wait at least 15 minutes. Set the 

key switch to "1". If possible, drive the appliance on level 

grounds only. If required, check the parking brake and the 

accelerator pedal.

Contactor open!! 

Emergency-stop 

button??

contactor open!! 

emergcy. button?

Press emergency-stop button.

Release emergency-stop button by turning. Set the key 

switch to "0". Wait at least 10 minutes. Set the key switch 

to "1".

Shut down, missing 

bus supply

Shutdown, missing 

bus supply

Inform Customer Service

26 EN

     

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11

Faults without display on the console

Fault

Remedy

Appliance cannot be started

Insert battery plug. 

Set main switch to “1”.

Unlock the emergency stop switch.

Check fuse F1, replace if required.  *

Check battery; charge it, if needed

Insufficient water quantity

Check fresh water level, refill tank if necessary.

Check hoses for blockages; clean if required.

Clean the fresh water filter.

Open the fresh water ball valve.

Insufficient vacuum perfor-

mance

Clean the seals between dirt water reservoir and cover and check for tightness, replace if required.

Clean the flat-fold filters at the suction support of the suction turbine.

Clean the vacuum lips on the vacuum bar, replace if required

Check suction hose for blockages; clean if required.

Check the suction hose for tightness; replace if required.

Check if the cover on the dirt water discharge hose is closed

Check the setting of the vacuum bar.

Insufficient cleaning result

Set/ adjust contact pressure.

Select a more intensive cleaning program.

Check the brushes for wear, replace if required.

Brushes do not turn

Reduce contact pressure.

Check if foreign matters block the brushes; remove foreign matter if required.

Optional overall lamp and/or 

working lamp is not functioning

Check fuse F3, replace if required. *

* The fuses are located in the flat insertion sockets on the wiring plate and can be accessed by opening the front panel.

Additional faults for the B 250 RI

Fault

Remedy

Machine is not sweeping properly

Check roller brushes and/or side brushes for wear, replace if necessary.

Roller brush does not rotate; check drive belt; remove dirt, if required. 

Check function of bulk waste flap

Check sealing strip for wear, adjust or replace as required.

Sweeper generates a cloud of dust

Empty waste container

Check drive belts for suction turbine of sweeper.

Check sealing cover on suction fan

Check dust filter, clean or replace.

Check filter case seal

Check sealing strips for wear, adjust or replace as required

Poor cleaning performance at edges

Set the inclination of the side-brushes; adjust, if required.

Replace the side brushes

27 EN