Service manual

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Merloni

Elettrodomestici

GB 2001-02-20/01 1-52

Language Issue/Edition Page

Service Manual

Dishwashers Mark II

Summary of content (52 pages)

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Merloni Elettrodomestici Service Manual Dishwashers Mark II Language Issue/Edition GB 2001-02-20/01 Page 1-52
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Merloni Elettrodomestici Service Manual LVS Mark II Language Issue/Edition GB 2001-02-20/01 Page 2-52
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Merloni Elettrodomestici Contents 1 DIWA 126 TIMER SAFETY DEVICE MANAGEMENT 5 1.1 Alarms displayed and operations to be carried out 5 1.2 Types of alarms not displayed valid for all models of Electronic Dishwashers 8 1.3 Examples of programs available for Free Installation Machines with DIWA 126 Timer8 1.4 DIWA 126 cycles 1.5 Testing/Autotest procedure 11 2 DIWA 123 LCD TIMER 12 2.
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Merloni Elettrodomestici 6 DISASSEMBLY OF MOTOR-SUMP UNIT 40 7 NEW OVERFLOW SYSTEM 43 7.1 New Float 44 8 NEW SYSTEM TO FIX MOTOR 46 9 NATURAL DRYING SYSTEM 48 10 ALTERNATE WASH MOTOR 50 10.1 Alternate Wash Motor Wiring Diagram 51 10.
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Merloni Elettrodomestici 1 DIWA 126 TIMER SAFETY DEVICE MANAGEMENT N.B. All the machines with four LEDS are equipped with a DIWA 126 Timer. 1.1 Alarms displayed and operations to be carried out 1.1.1 Acquastop Sensor Operation (overflow) LED 1 activation 1 2 0 3 0 4 0 The control continually monitorises the status of the acquastop sensor switch. If it is closed for more than 5", there is a permanent fault.
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Merloni Elettrodomestici 1.1.2 NTC fault LED 3 activation 1 0 2 0 3 4 0 The electronic control constantly checks the temperature sensor status; if it is open or there is a short circuit, there is a fault. Machine performance • Resets all active settings • Deactivates all loads Checks to be carried out • Short-circuited thermistor open • Thermistor connector incorrectly joined to timer • Thermistor fault 1.1.
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Merloni Elettrodomestici 1.1.4 Pressure switch full timeout during water filling LEDS 2 + 3 alternate activation 1 0 2 3 4 0 During the static filling phase (with washing pump deactivated) the control waitsfor max 6', after which a fault has occurred. Machine performance • Resets all active settings • Deactivates all loads • Drains until pressure switch empty +1' Checks to be carried out • Water pressure not less than 0.2 bar (for correct operation is must be more than or equal to 0.
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Merloni Elettrodomestici 1.2 Types of alarms not displayed valid for all models of Electronic Dishwashers 1.2.1 Machine jammed (programming impossible) 1. Reset the dishwasher when it is operating, by turning the knob to “Reset” or pressing the “Reset” button. Open the door to allow program resetting. 2. Leakage, in this case the machine is blocked: • invert position of the plug in the socket • check plug earth • if the fault continues, disconnect the earths of the motor, heater, filter 1.2.
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Merloni Elettrodomestici DIWA 126 cycles Service Manual LVS Mark II 6 7 X X X X P 40° V P X X P V P X X X X P 38° 50° 56° 68° V X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X V V V P P V P P 50° 68° V V V X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X P P V X X P V SOAK 5 RAPID 25 4 RAPID DRYING 68˚ 3 GLASS 2 NORMAL V P 1 DAILY Pre-washes Draining 16" Static filling up to P Fil
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Merloni Elettrodomestici Service Manual LVS Mark II 6 7 X X X X X X X X X X X X X SOAK 5 RAPID 25 4 RAPID DRYING 68˚ 3 GLASS P 2 NORMAL V P 1 DAILY Pre-washes Draining 16" Static filling up to P Filling time 20" Dynam. filling up to P Washing pump 8' Washing pump 28' Heats Drains+1' Static filling up to P Filling time 20" Dynam. filling up to P Washing pump 4' Heats Washes Static filling up to P Filling time 20" Dynam.
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Merloni Elettrodomestici 1.5 Testing/Autotest procedure To start the procedure, follow the instructions below: 1. Reset the machine with the “Reset” button 2. Select OFF (machine shutdown) 3. Check that the appliance door is closed 4. Turn the selector to “2” 5. Select ON (machine operating) and then turn the selector from “2” to “1” and vice versa, until the LEDS “1” - “4” start blinking 1 0 2 0 3 0 4 6. Switch the machine off and then on again. 7.
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Merloni Elettrodomestici 2 DIWA 123 LCD TIMER N.B. All the machines with a display are equipped with a DIWA 123 LCD Timer. 2.1 Description of Faults Displayed for Machines with DIWA 123 LCD Timer and operations to be performed 2.1.1 Displays A01 Acquastop Sensor Operation The control continually monitorises the status of the acquastop sensor switch. If it is closed for more than 5", there is a fault.
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Merloni Elettrodomestici 2.1.2 Displays A02 Heater Relay in Closed Circuit - Open Circuit All the time the drive relay of the heating element is idle with the door closed, the electronic control checks that its contacts are actually open. If the control contacts are erroneously closed, a fault has occurred.
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Merloni Elettrodomestici 2.1.4 Displays A04 Incorrect heating time During the washing + heating phase, the control waits for the set temperature to be reached for max 70', after which there is a fault. Machine performance • Resets all active settings • Deactivates all loads • Drains until pressure switch +1' Checks to be carried out • Thermistor support bracket (probably disconnected) • Capsule contact with tank base • heater operation 2.1.
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Merloni Elettrodomestici 2.1.6 Displays H2O Incorrect Pressure switch Full time During the static filling phase (with washing pump off) the control waits for max 6', after which it is definitely faulty. Checks to be carried out • Water pressure not less than 0.2 bar (for correct operation is must be more than or equal to 0.2 bar) • Water supply tap closed • Pressure switch stuck on empty • Electric timer (Card) blocked • Solenoid valve 2.1.
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Merloni Elettrodomestici 2.1.9 Displays A09 Main winding pump triac with Closed Circuit - Open Circuit Machine performance • Drains until pressure switch empty +30" Checks to be carried out • Wash motor correct operation 2.1.10 Displays A10 Load solenoid valve triac with Closed Circuit - Open Circuit Machine performance • Drains until pressure switch empty +30" Checks to be carried out • Disconnected load solenoid valve correct operation 2.1.
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Merloni Elettrodomestici 2.1.13 Displays A13 Dispenser triac incorrect operation with Closed Circuit - Open Circuit Machine performance • The appliance continues the wash cycle, but the detergent compartment lid does not function properly Some machine faults which are not displayed change the washing performance required.
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Merloni Elettrodomestici 2.2.1 DuoWash This cycle is extremely delicate on glass and strong and energic on heavily soiled pots. All inside the same washing load: • The delicate dishes are washed with reduced pressure and only for 30% of the total cycle time, • The heavily soiled dishes are washed with maximum pressure and for 70% of the total cycle time. Wash performance 1. Alternate wash (first above and then below and vice versa) 2.
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Merloni Elettrodomestici 45° 5 6 7 Soak X X X X 4 X X X X X X X X X X X X X X X X X V X P X X X X X X X X X X X X 50° X X X X X X X X X X X X 38° Hot Rinse V P 3 Rapid Alternation X X 2 Crystal V P 1 After Dinner Pre-washes Draining 16'' Total static load Washing pump 8' Drains+1' Total static load Heats Washing pump 4' Washing pump 24' Draining 1' Washes Total static load Pump+detergent 1' Pump+regenerate 1' Heats Pump+detergent 1' Heats Washing pump 8' Heats+pump 5' W
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Merloni Elettrodomestici In the first part of the ramp the auxiliary winding is disconnected so that only the upper basket is washed. As shown in the line chart, there are two regenerate steps. The first is carried out by all the 15' drying cycles. In the 40' cycles, the regenerate phase takes place when the drying starts. Dishwasher with Drying Fan ON Drying Regenerate Drying 13'+Vent.
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Merloni Elettrodomestici Service Manual LVS Mark II V P 30° 35° 40° 45° 50° X X X X X X X X X X X 2 3 4 1 2 3 4 1 2 3 4 X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X 5 6 7 X X X X X X X X X X X X X X X X X X X X X X V X X X X P X X X X X X X X X X X X 38° Auto crystal&pot DuoWash Auto Normal 1 4 Hot Rinse X X 3 Rapid V P 2 Crystal Level of turbidity Pre-washes Dr
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Merloni Elettrodomestici Drying phases 1. 2. 1. 2. Dishwater with drying fan ON In this case drying time will be 40' Dishwasher with drying fan OFF. In this case drying time will be 15' Dishwasher without drying fan ON. In this case drying time will be 15' Dishwasher without drying fan OFF. In this case drying time will be 0 Alternating steps In some models (see column Alternation), there is an alternate wash with a complete cycle of 4': 3' in the lower basket and 1' in the upper basket.
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Merloni Elettrodomestici Dishwasher without Drying Fan ON Drying Regenerate Drying 10' Drying 5' Draining 1' Filling time 15" Draining 1' Drying 1' Draining 30" Filling time 15" Draining 30" Drying 1' Draining 30" End V V V V V X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X
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Merloni Elettrodomestici Service Manual LVS Mark II 30° 35° 40° 45° 50° X X X X X X X X X X X 2 3 4 1 2 3 4 1 2 3 4 X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X 5 6 7 X X X X X X X X X X X X X X X X X X X X X X X X V X X X X P X X X X X X X X X X X X 38° Auto crystal&pot Auto Normal 1 4 Hot Rinse V P Auto Intensive Alternation X X X 3 Rapid V P 2
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Merloni Elettrodomestici Drying phases 1. 2. 1. 2. Dishwater with drying fan ON In this case drying time will be 50' Water discharge plus 10’ of the fan Dishwasher with drying fan OFF. In this case drying time will be 15' Dishwasher without drying fan ON. In this case drying time will be 60' Water discharge plus 0’ Dishwasher without drying fan OFF.
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Merloni Elettrodomestici Dishwasher without Drying Fan ON Drying Regenerate Drying 60' Draining 1' Filling time 15" Draining 1' Drying 1' Draining 30" Filling time 15" Draining 30" Drying 1' Draining 30" End V V V V V X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X
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Merloni Elettrodomestici 2.5 Testing/Autotest procedure To start the procedure, follow the instructions below: 1. Reset the machine with the “Reset” button 2. Select OFF (machine shutdown) 3. Check that the appliance door is closed 4. Turn the selector to “Reset” 5. Press and hold the “Deley” button and select ON (switched on) At this stage an acoustic signal will sound. 6. Always keeping the “Deley” button pressed, select OFF (switched off) and then ON (switched on) again.
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Merloni Elettrodomestici 3 TOTAL EMBEDDING DISAPPEARANCE WITH DIWA 126 TIMER 3.1 Warnings Led 1 Intensive Cycle Led 2 Daily Cycle Led 3 Crystal Cycle Led 4 Rapid Cycle Led 5 Soack Cycle I D C R S Overflow NTC c.a. or in c.c. Heating Timeout Discharge Timeout Pressure switch Timeout P.
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Merloni Elettrodomestici 4 TOTAL EMBEDDING DISAPPEARANCE WITH DIWA 123 TIMER AS I D C&P C R S SS SB 1/2 2h 4h P LD1 LD2 LD3 LD4 LD5 LD6 LD7 I D C&P C R S KS1 6h D LD8 LD9 LD10 KS2 LD11 LD12 LD13 KS3 Auto Intensive Auto Daily Auto Crystal & Pot.
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Merloni Elettrodomestici I D C&P C R HR S SS SB 1/2 2h 4h P LD1 LD2 LD3 LD4 LD5 LD6 LD7 I D C&P C R HR S KS1 6h D LD8 LD9 LD10 KS2 LD11 LD12 LD13 KS3 Auto Intensive Auto Daily Auto Crystal & Pot.
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Merloni Elettrodomestici I D C&P C R S SS SB 1/2 2h 4h 6h P LD2 LD3 LD4 LD5 LD6 LD7 I D C&P C R S KS1 D LD8 LD9 LD10 KS2 LD11 LD12 LD13 KS3 Intensive Daily Crystal & Pot. Crystal Rapid Soack Characteristics • Alternate • – load up • Delay timer 2-4-6 hours • Turbidity sensor • Use of low speed in the Crystal & Pot programme when the machine washes the upper basket • Use of low speed in the Crystal programme both when the machine washes the upper basket and the lower basket. N.B.
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Merloni Elettrodomestici 4.1 Functioning 4.1.1 Machine in idle • If the machine is not set the programming diodes are switched off. It is possible that the salt spy and gloss spy will be “on”. • All the setting carried out by the user must be done with the door open, because the machine will not accept any commands if the door is closed unless one wants to “enter” into one of the accessory cycles (Service and Running-in). 4.1.
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Merloni Elettrodomestici The following scheme will apply: a) if there are ≤ 2 hours left to the starting of the programme then the diode corresponding to 2h delay will flash b) if there are ≤ 4 and > 2 hours left to go the diode corresponding to 4 h delay will flash c) there are ≤ 6 and > 4 hours left to go the diode corresponding to 6 h delay will flash Upon completion of the washing the diode, corresponding to the set programme, will continue to flash “softly” until the programmes setting key is pressed;
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Merloni Elettrodomestici Instance in which there has been a running-in entry: During the entire running-in stage, consisting in heating and release of washing powder and subsequent discharge stage, the machine will keep the LD4, LD5, LD6, LD7 programme diodes lit up; in the subsequent loading stage the various steps indicated by the sequential activity of the LD4, LD5, LD6, LD7 diodes in the way as mentioned hereunder: 1) 2) 3) 4) 5) 6) 7) 8) 9) 10) 11) 12) LD4 LD5 LD6 LD7 Ev.
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Merloni Elettrodomestici 4.1.7 Faults 4.1.8 intervention(1) LD7 On Off On Off On On Off On Off On Off On Off 1) 2) 3) 4) 5) 6) 7) 8) 9) 10) 11) 12) 13) Water-stop Relay in c.c Probe in c.c./c.a. Temperature reaching time-out Empty press. Reaching time-out Discharge Triac pump in c.a. Aux. avv. Triac pump in c.c./c.a. Prin.avv. Triac pump in c.c./c.a. Ev. load triac pump in c.c/c.a. Ev._load or alt. Motor Triac. Relay in c.a. Triac dispenser in c.c./c.a.
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Merloni Elettrodomestici 5 EMBEDDING WITH FRONTAL VIEW D DG1 DG2 1/2 SS SB LD1 LD2 LD3 C&P C I R S Reset D KS1 I D C&P C R S KS2 Intensive Daily Crystal & Pot. Crystal Rapid Soack Characteristics • Alternate • – load up • Delay timer from 1 to 9 hours • Turbidity sensor • Use of low speed in the Crystal & Pot programme when the machine washes the upper basket • Use of low speed in the Crystal programme both when the machine washes the upper basket and the lower basket. N.B.
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Merloni Elettrodomestici 5.1 Functioning 5.1.1 Machine in idle • If the machine is not set the 2 digits and relative diode for half load are off, the salt and glossing spies are lit up. 5.1.2 Setting up of the delay timer • Every time the delay timer setting-up key is pressed the machine will produce a beep sound and will show on the 2 digits the value of the delay that has been set. Example: for a setting-up of a 6 hours delay, the machine will show 6H. 5.1.
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Merloni Elettrodomestici 5.1.5 Resetting the set-up It is possible to reset the washing cycle by putting the selector on the resetting position 4". 5.2 Entry in testing 1. 2. 3. 4. 5. Door shut. Selector in reset position. Activate the machine by keeping delay setting key pressed. The machine will produce a beep sound. Deactivate and reactivate the machine by keeping delay setting key pressed. 6. The machine will produce a beep sound and will show C0. 7.
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Merloni Elettrodomestici The functioning is made up of the loading sequence only (steps 1)..11)). N.B. 5.3 Faults 1) 2) 3) 4) 5) 6) 7) 8) 9) 10) 11) 12) 13) 5.4 If the set programme is the running-in then the fault finding routine is not active. If the set programme is functional then the faults finding routine is active. Water-stop intervention Relay in c.c Probe in c.c./c.a. Temperature reaching time-out Empty press. Reaching time-out Discharge Triac pump in c.a. Aux. avv.
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Merloni Elettrodomestici 6 DISASSEMBLY OF MOTOR-SUMP UNIT The overflow system is integral with the motor unit. After releasing the impeller, to disassemble the motor it is necessary to unscrew the overflow head as shown in the Fig. 1 and then unscrew the lower clearance ring. Fig.
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Merloni Elettrodomestici Fig. 2 Fig.
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Merloni Elettrodomestici Fig. 4 1 1 Remove and replace band after operation Fig. 5 1 2 3 1 2 3 Service Manual LVS Mark II Lower part of the overflow head, located above the motor with non barycentric spring.
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Merloni Elettrodomestici 7 NEW OVERFLOW SYSTEM The system is activated when a water overflow occurs, due to component malfunction (e.g.: Pressure switch, Timer, etc.) thus avoiding flooding. If more than 9.5 litres of water enter into the tank the system is activated. The water overflow level in the tank is determined by the position of the holes on the head, as shown in Fig. 6. Fig.
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Merloni Elettrodomestici The overflowing water flows through the drain hose (Fig. 7) and triggers the micro switch with about 0.5 litres. Fig. 7 1 2 3 1 2 3 7.1 Overflow tray under dishwasher Float with microswitch Correct position of overflow hose on tray New Float The new float which will replace the current one is shown in the Fig. 8. Fig. 8 The new float is designed to prevent dishwashers with an alternate wash motor from obstructing the movement if there is an overflow. N.B.
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Merloni Elettrodomestici The Fig. 9 shows the incorrect position of the overflow hose which passes under the wiring, not allowing correct operation of the system. Fig. 9 1 1 Incorrect position of overflow hose N.B. Service Manual LVS Mark II The overflow hose must pass over the wiring, because if it is positioned as shown in the figure, it would create a loop which would not allow the water to flow, thus preventing the overflow system from working properly.
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Merloni Elettrodomestici 8 NEW SYSTEM TO FIX MOTOR The new system consists in a non-barycentric spring, locked on the right-hand side of the motor and fixed to the base of the tank with the lower part of the overflow head. This allows motor suspension, thus reducing noise caused by vibrations. Fig.
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Merloni Elettrodomestici The Fig. 11 shows how to proceed to disassemble the non barycentric spring. Fig.
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Merloni Elettrodomestici 9 NATURAL DRYING SYSTEM This new airbrak, located above the tank, allows the steam produced during the warm rinse (temperature reaches 66˚C/67˚C) to be released more easily. Part of the steam will be eliminated through the airbrak and a smaller part will condense. Condensate will be eliminated by means of a lateral pocket connected to the drain of the appliance. Fig.
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Merloni Elettrodomestici Fig. 13 1 1 Airbrak position N.B. Service Manual LVS Mark II The position of the airbrak is very important, as indicated in the Fig. 13, to prevent steam from leaking and damaging the machine top.
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Merloni Elettrodomestici 10 ALTERNATE WASH MOTOR Fig.
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Merloni Elettrodomestici 10.1 Alternate Wash Motor Wiring Diagram Fig. 15 M 2 3 5 1 4 4 1 2 3 10.2 Electronic timer Motor Common 4 5 Sensing Driven actuator for alternate wash Sensing signal The sensing device determines the water flows on the upper and lower impeller, alternately, reducing wash noise. Fig. 16 ON OFF 1 2 3 1 A+B A B A+B T3 T1 T2 T3 3.05" 73° 4.05" 97° 7.
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Merloni Elettrodomestici Merloni Elettrodomestici spa viale Aristide Merloni, 47 - 60044 Fabriano tel. 0732/6611 - telex 560196 - fax 0732/662954 www.Merloni.