Electrolux EDW5505E Service Manual - Page 88

Electrolux EFS - Dishwashing Systems Platform Electrolux Professional Electronic Dishwasher SERVICE MANUAL E Alarms that stop the dishwasher for models with incorporated continuous water softener f21 F22 Water softener operation errors This alarm appears in case of malfunctioning in the continuous water softener. 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 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. 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. DOC. NO. 5956.446.06 ©Copyright 2005 by Electrolux Professional P.88/88