Electrolux
EFS – Dishwashing Systems Platform
Electrolux Professional
Electronic Dishwasher
SERVICE MANUAL
DOC. NO. 5956.446.06
©Copyright 2005 by
Electrolux Professional
P.88/88
E Alarms that stop the dishwasher for models with incorporated
continuous water softener
f21
Water softener operation errors
This alarm appears in case of malfunctioning in the continuous water softener.
F22
Communication errors between the mother board and
softener board
This alarm appears in case of problems in communication between the mother board and water softener
board; check the connection between mother board connector J1 and water softener connector ST8.
To facilitate the finding of faults signalled by alarm
F21
, another parameter providing a more detailed indication of the possible cause of
malfunction has been introduced in the
RoN
family (see table below).
f21 1
Water softener conductivity sensor short-circuit
Two or more water softener conductivity sensors are short-circuited. Check the connections between the
water softener board and sensors, replacing the connection wiring if necessary.
f21 2
Water softener conductivity sensors open
One or more water softener conductivity sensors are disconnected. Check the connections between the
water softener board and sensors, replacing the connection wiring if necessary.
f21 3
Resin temperature sensor malfunction
Replace the water softener electronic board.
f21 4
Water softener electronic board malfunction
Replace the water softener electronic board.
f21 6
Salt water filling malfunction
The salt water container in the water softener was not completely filled within the set max. filling time.
Make sure:
−
the water cock is open
−
the water filling solenoid valve works correctly
−
the salt container solenoid valve works correctly
−
the feed water pressure is at least 50 kPa / 0.5 bar
−
the water inlet filter is clean
−
the filling solenoid valve filter is clean
−
the salt container cap is properly closed
−
the mother board (ATM-PRES) connector CN2 is correctly positioned
−
the water softener board connector ST5 is correctly positioned.
f21 7
Inefficient resin washing
After carrying out the maximum permissible number of resin washes, the resins are not sufficiently cleaned
by the salt water used to regenerate them.
Make sure:
−
the water filling solenoid valve works correctly
−
the feed water pressure is at least 50 kPa / 0.5 bar
−
the water inlet filter is clean
−
the filling solenoid valve filter is clean
−
the mother board (ATM-PRES) connector CN2 is correctly positioned.
