Nilfisk-Advance R 253 9087362020 Service Manual page 101

Service Manual – Scrubtec R 253 - RA40
Troubleshooting (Continues)
Trouble
The Chemical Mixing System detergent is
not reaching the brush, or is not arriving
in sufficient quantity
The Chemical Mixing System detergent
is reaching the brush even with the
machine off
Water is entering the Chemical Mixing
System tank
The Chemical Mixing System will not
activate
Figure 9
Possible Causes
The detergent flow percentage is too low
The hydraulic circuit upstream of the detergent pump is
not triggered
The pump (M1) is broken or there is an open in the
electrical connection
There is foreign material/debris in the detergent tank
clogging the output hole
There is debris in the detergent hoses clogging the
detergent flow
Function electronic board (EB1) faulty
Display electronic board (EB2) faulty
Dashboard instrument electronic board (EB4) faulty
The pump (M1) is broken
The one-way valve is broken
The one-way valve is broken
Dashboard instrument electronic board (EB4) faulty
The function electronic board (EB1) has not been set for
operation with the Chemical Mixing System
Solution System
Remedy
Check/change the percentage as
shown in the User Manual
Check if the hose is filled and, if
necessary, perform one or more
draining cycles
Replace the pump/repair the
electrical connection
Clean the tank
Clean the hoses
Replace
Replace
Replace
Replace
Replace
Replace
Replace
If present, remove the jumper
(J6) (Figure 9) on the rear of the
function electronic board
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