CONTENTS PURPOSE OF THIS SERVICE MANUAL ....................6 IMPORTANT NOTES ..........................6 WASHING PRINCIPLES ........................7 Washing ............................. 7 3.1.1 Results of the wash........................7 Fabrics ............................... 8 3.2.1 Natural and artificial fibres......................8 3.2.2 Washing the various types of fibres ................... 8 3.2.3 Washing animal fibres:.......................
5.2.2 Electrical symbol ........................34 5.2.3 Checking for efficiency ......................34 Door safety interlock (traditional version) ..................35 5.3.1 General characteristics ......................35 5.3.2 Electrical symbol ........................35 5.3.3 Circuit diagrams ........................35 5.3.4 Checking for efficiency ......................36 Instantaneous door safety interlock ....................36 5.4.1 General characteristics ......................
5.16.2 Wiring ............................55 5.16.3 Part numbers for wiring ......................55 5.16.4 Basic circuit diagram ........................ 56 ACCESSING COMPONENTS ......................57 Access from the work top ........................ 57 6.1.1 Electronic pressure switch ....................... 57 6.1.2 Pressure swtich........................57 6.1.3 Suppressor ..........................58 6.1.4 Cable grommet.........................
PURPOSE OF THIS SERVICE MANUAL The purpose of this Service Manual is to provide Service Engineers, who already have the basic knowledge necessary to repair household washing machines, with information of a general nature regarding the HEC range of washing machines. More detailed information regarding specific models may be found in the Service Notes and Service Manuals (issued separately) for each specific model or functionality.
WASHING PRINCIPLES 3.1 Washing The washing of the fabrics consists of transferring the dirt from the fabrics to the water, and is achieved using the following: detergent mechanical action temperature time The washing operation comprises four phases: 1. Soaking (the fabrics must be completely soaked). 2.
3.2 Fabrics 3.2.1 Natural and artificial fibres NATURAL FIBRES Wool ANIMAL FIBRES Special wool Silk Cotton Linen CELLULOSE VEGETABLE FIBRES Canapa Hemp Ramie ARTIFICIAL FIBRES Viscosa rayon Cupro rayon Special rayons ARTIFICIAL CHEMICAL FIBRES Rayon and polynosics Acetate rayon Triacetate rayon Polyamide fibres Polyurethane fibres SYNTHETIC CHEMICAL FIBRES...
3.2.4 International symbols for washing of fabrics Labels marked with the following symbols are affixed to the garments, and provide valuable information relative to their treatment. WASHING ACTION Wash at Wash at Wash at Wash at NORMAL 95°C 60°C 40°C 30°C Delicate DO NOT...
3.3 Classification of soiling The dirt in the fabrics consists essentially of: PROTEICN-BASED substances OXIDABLE substances GREASE VARIOUS substances CHEMICAL substances Protein soiling (enzymatic) - sensitive to ENZYMES Blood, Eggs, Chocolate, Grass etc. Oxidable substances - sensitive to BLEACH Wine, Tea, Coffee, Fruit etc. Greasy soiling - sensitive to SURFACE-ACTIVE AGENTS Oil, Butter, Salt etc.
Water Water is the most important element in the washing process, and is fundamental to the final result. Ideally, the water used for the wash should have the following composition: Clear and transparent, a low level of hardness, absence of manganese, low iron and mineral salt content.
3.6.3 Total water hardness Total hardness is the sum of the temporary hardness (caused by calcium and magnesium bicarbonates) and the permanent hardness (caused by sulphates, chlorides and calcium/magnesium nitrates). Hardness expressed in French degrees (°F) represents the quantity of calcium carbonate, in grammes, contained in 100 litres of water.
3.7 Detergents Modern detergents are less aggressive than those used in the past, partly for reasons of environmental protection and partly to prevent damaging the fibres. If used correctly, these offer an excellent protective treatment and a high level of washing power. Detergents that contain no phosphates are far more sensitive to the reaction with calcium.
3.7.3 Functions of other components of a detergent 1. ENZYMES: Enzymes are proteins produced by living cells (animal and vegetable) and are able to transform organic materials with a high molecular weight, such as starches, proteins and fats, into more easily soluble products.
3.7.4 Detergent quantities - efficiency of the washing programme according to the load and the water hardness. In order to perform its function completely and correctly, the appropriate quantity of detergent must be used, which depends on the quantity of water that is contained in the tub of the washing machine, the type of washing cycle, the type of fabrics, the type of soiling and the quantity of washing in the drum.
3.7.5 Washing additives 1. SOFTENER: (Cationic surface-active agent + fragrance): This additive is introduced automatically by the appliance during the final rinse. It softens the surface of the fabric, which thus remains soft to the touch and easier to iron. If used incorrectly before or during the wash, or if introduced too early into the tub by the water fill system, its action is rendered ineffective by the surface-active agents contained in the detergent.
3.8 The function of the water temperature The variety and quality of natural and synthetic fibres which comprise the fabrics, which are sometimes present in percentages that are not declared correctly on the labels, make it necessary in many cases to use a detergent whose washing action is effective at low temperatures.
Washing machine programmes 1. Water fill with detergent introduced from the pre-wash compartment Pre-wash 2. Brief heating phase and hot wash (30 - 40°C) (not for wool and, in some 3. Drain cases, delicate fabrics) 4. (Brief spin) 1. Water fill with detergent introduced from the wash compartment 2.
4.1.1 “ECO-BALL” ball valve The "Eco-ball" valve consists of a sphere contained inside the tube that connects the tub to the filter body. Its purpose is to keep the washing water (contained in the tub) separate from the water in the drain circuit. Advantages with respect to a conventional circuit: Energy savings: the water inside the drain circuit is not heated.
4.1.3 “JETSYSTEM” washing system In the "Jetsystem" washing system, considering that the removal of the dirt is performed solely by the water that passes through the fibres, the remaining part of the washing solution has been eliminated. In other words, this system is based on the possibility of washing the fabrics using only the water used to wet them;...
Cabinet The cabinet consists of a steel metal-plate shell on which are screwed the inferior crossbars and the back side; the rear panel and the front panel are screwed to the cabinet to facilitate the access to the components. 1. Front panel 2.
Control panel The plastic control panel is secured to the control panel support by some screws. The shape of the control panel depends on the styling and therefore the brand of the appliance. Various types of control panels are available for each styling, each fitted with a different number of buttons and knobs.
Washing groups The washing group is suspended from the support crosspiece by two helical springs. The oscillation of the washing group is absorbed by the two dampers attached to the lower crossbars. Balancing of the washing group is provided by a front counterweight in cement and by a rear counterweight. 4.5.1 Types of washing groups The washing machines may be fitted with washing groups of varying dimensions and spin speeds.
4.5.2 Washing group The tub consists of two half-shells in Carboran, secured together by a series of self-tapping screws (in the future the two half-shells will no longer be secured with screws but sealed between them). The two counterweights are screwed to the half-shells. The bellows seal is secured to the front half-shell by a metal elastic ring.
22.214.171.124 Drum The drum consists of a stainless steel casing to which the two flanges are crimped. Three Carboran lifters are pressure-fitted to the internal face of the drum. The drum spider, in aluminium alloy, is secured to the edge of the drum by screws.
126.96.36.199 Drum rotation drive belt These appliances are fitted with elastic drive belts. The motor is mounted in a fixed position, and no regulation is possible. 1. Motor pulley 2. Elastic drive belt 3. Drum pulley Different types of drive belts, produced by various manufacturers and with different characteristics, are used in production.
Detergent dispenser 4.6.1 Detergent dispenser with multiple-outlet solenoid valve ("long" version) The water is ducted into the detergent compartment by a solenoid valve with one inlet and 2 or 3 outlets. The detergent drawer may consist of 3 or 4 compartments. 1.
188.8.131.52 Operating principle Water fill to pre-wash compartment (Pre-wash solenoid valve) • This version is used in models with three or four compartments: The detergent contained in compartment "a" is introduced at the beginning of the pre-wash phase. • In certain models featuring the "stains" option, compartment "a" may be used (as an alternative) to contain the stain-removal product, which is introduced during the wash phase.
184.108.40.206 Operating principle Water fill to pre-wash compartment (Pre-wash solenoid valve) • This version is used in models with 3-compartment detergent dispensers. The detergent contained in compartment "a" is introduced at the beginning of the pre-wash phase. • In certain models featuring the "stains" option, compartment "a"...
Washing machine with traditional washing system and “ECO-BALL” ball valve 1. Drain pump 2. Filter body 3. Drain filter 4. Washer 5. Filter knob 6. Tube between tub and filter body 7. Ball 8. Pressure chamber (one or two ways) “NEW JET”...
ELECTRICAL COMPONENTS Suppressor 5.1.1 General characteristics The suppressor is connected to the input of the appliances power line, and prevents radiofrequency disturbance from entering the power circuit. 5.1.2 Electrical symbols 5.1.3 Circuit diagrams 5.1.4 Checking for efficiency THE APPLIANCE GENERATES RADIOFREQUENCY DISTURBANCE: check the efficiency of the earth circuit THE APPLIANCE IS INOPERATIVE: Use an ohmmeter to check that the component is not faulty:...
Push-button 5.2.1 General characteristics Single-button versions are used. These differ as regards the number and functionality of the contacts: switch deviator (single- or two-pole) 5.2.2 Electrical symbol Normally-closed switch Normally-open switch Deviator 5.2.3 Checking for efficiency DOES NOT POWER THE APPLIANCE OR DOES NOT PERFORM THE SPECIFIC FUNCTION: Use a tester to check for correct closure (or aperture) of the various contacts.
Door safety interlock (traditional version) 5.3.1 General characteristics The electromechanical door safety device performs the following functions: • When powered, the voltmetric safety interlock closes the contacts of the main switch that powers the electrical components of the appliance (only if the door is closed).
5.3.4 Checking for efficiency THE DOOR DOES NOT OPEN AT THE END OF THE CYCLE: Operate the washing machine so that the door delay device is powered for about 30 seconds. Switch off the appliance. The door should be released within about 2 minutes. If not, the door interlock is faulty.
220.127.116.11 "Door open" conditions The main PCB, before sending the door aperture signals, checks for the following conditions: • The drum must be stationary (no signal from the tachymetric generator) • The water level must not be higher than the lower edge of the door •...
Solenoid valve 5.5.1 General characteristics The solenoid valve ducts water through the detergent dispenser, and is controlled electrically by the pressure switch. 1. Water intake 2. Solenoid valve body 3. Filter 4. Flow reducer 5. Coil 6. Spring 7. Moving core 8.
Pressure switch 5.6.1 General characteristics The function of the pressure switch is to determine the quantity of water to be introduced into the tub. In other words: It controls the water fill levels during the washing phases. It acts as an anti-boiling safety device when connected in series to the heating element.
5.6.3 Operating principle Tub empty Water flows into the tub Water is drained from the tub As there is no water in the tub, When the connection between the As the level of water in the tub there is no pressure on the tub and the pressure chamber is diminishes, the pressure exerted diaphragm, which thus remains in...
Analogue (electronic) pressure switch 5.7.1 General characteristics The electronic pressure switch is an analogue device whose function is to control the level of water in the tub; it is used in certain models with electronic control systems. The electronic circuit is connected directly to the main PCB. 5.7.2 Operating principle 1.
5.7.3 Electrical symbol 5.7.4 Circuit diagrams and operating frequency 5.7.5 Checking for efficiency In the event of a fault in the pressure switch, the operation of the appliance is immediately interrupted. Where possible, always read the alarm code. Possible alarm codes caused by faults in the pressure switch: E31, E32, E33, E34, E35 42/71 SOI/DT 2006-01 dmm...
Commutator motor 5.8.1 General characteristics Commutator motors are fitted to appliances with spin speeds of between 600 and 1,600 rpm. It is possible that motors produced by manufacturers other than the original manufacturer may have the same part number, but these are perfectly interchangeable.
18.104.22.168 Control of the speed of the motor Speed control is obtained by using an electronic control system to vary the voltage (V) applied to the motor. The technique used consists of a "phase division" performed by the Triac. A Triac is a bi-directional electronic switch.
22.214.171.124 Tachometric generator As in all motors powered in series, the speed of the commutator motor depends on the load. In other words, its speed diminishes as the load increases. This makes it necessary to ensure that the power voltage to the motor, and therefore its speed, be constantly controlled by an electronic speed control system.
5.8.4 Circuit diagram P = Motor overload cut-out R = Rotor S = Stator T = Tachometric generator 5.8.5 Checking for efficiency 1. Check the connector blocks (wiring) and check for any bent or detached terminals. 2. Check for traces / residue / deposits of water or detergent and identify their source. 3.
Induction motors (asynchronous) 5.9.1 General characteristics The function of the motor is to rotate the drum at different speeds: high speed for the spin phases low speed for the wash phases The primary characteristic of these motors is that they do not require a start-up current. Instead, the current in the rotor builds up by induction, hence the name "induction"...
5.10 Inverter (if featured) The EWM3000 electronic control system uses a new 2-pole, three-phase, asynchronous motor offering high performance at low noise levels. “INVERTER” Electric wiring = Phase = Neutral = Inverter board = Motor = Condenser = Diodes I1-6 = Switches F1-3 = Motor connectors µ...
5.11 Heating element 5.11.1 General characteristics The heating element that heats the washing water is encapsulated, i.e. inserted into a watertight stainless steel tubular casing. 1. Heating element (1950W) 2. NTC sensor Seal The seal between the tub and the heating element is provided by a seal which expands against the nut. 1.
5.12 NTC temperature sensor (incorporated in the heating element) 5.12.1 General characteristics In the electronic models an NTC sensor is used to control the washing temperature. In these sensors, the internal resistance decreases as the temperature increases. This reduction in resistance is detected by the electronic control system which, when the desired temperature is reached, disconnects the heating element.
5.13 Drain pump 5.13.1 General characteristics The function of the drain pump is to discharge the water at the end of each phase of the washing cycle. These centrifugal pumps are actioned by a synchronous motor. 1. Impeller 2. Rotor 3.
5.14 Water control (if featured) The Water Control system is a sensor located in contact with the base frame. The sensor detects water leaks inside the machine (not only during normal operation, but also when the unit is off and plugged in) and starts the drain pump if a leak occurs.
5.15 Circulation pump (if featured) 5.15.1 General characteristics Jetsystem models are fitted with a synchronous circulation pump which continuously circulates the water from the filter body into the tub through the bellows seal. 5.15.2 Electrical symbol 5.15.3 Checking for efficiency NO RE-CIRCULATION - POOR WASHING RESULTS Check that the impeller is not jammed and check for slippage.
5.16 Circuit diagrams Each model produced is accompanied by a wiring diagram and a basic circuit diagram. 5.16.1 Wiring diagram An example of a wiring diagram is shown below. The wiring diagram may be used to check for correct connection of the wiring connectors to the various electrical components. 54/71 SOI/DT 2006-01 dmm 599 37 47-13...
5.16.2 Wiring Two types of wiring harness are used for the various models: • Modular: the wiring harness consists of a series of sections fitted with connectors. • Single: the wiring consists of a single main harness. There may be separate wires for connection to earth.
5.16.4 Basic circuit diagram An example of a basic circuit diagram is shown below. The circuit diagram should be used to check the appliance for correct operation in the diagnostics phase. Wire Internal connection 56/71 SOI/DT 2006-01 dmm 599 37 47-13...
6 ACCESSING COMPONENTS Access from the work top a. Remove the two rear screws which fit it to the cabinet. b. Push the work-top towards the rear of the appliance and detach. From the work top it is possible to access to: Pressure switches Suppressor Cable grommet and power cable...
6.1.3 Suppressor a. Remove the work top. b. Unscrew the nut which fit the suppressor to the cabinet. c. Detach the wiring connectors. 6.1.4 Cable grommet d. Remove the work top. e. Press the cable grommet with pliers and push it outward. N.B.
6.1.6 Control panel a. Extract the detergent drawer. b. Remove the screws that secure the control panel to the control panel support. c. Remove the screws which secure the control panel to the crosspiece. d. Release the anchor tabs from the support. e.
6.1.9 Detergent dispenser a. Remove the work top. b. Unscrew the clamp and detach the tube from the detergent dispenser to the tub. c. Extract the detergent drawer. d. Remove the screw which secures the control panel to the detergent dispenser and detergent dispenser to the crosspiece.
Access from the front panel From the front panel it is possible to access to: Door Door hinge Door safety interlock Bellow seal Front side Filter pump body 6.2.1 Door a. Remove the two screws which secure the door to the hinge. b.
6.2.4 Bellows seal a. Detach the retaining ring and the seal from the front panel. b. Remove the clamp and pull out the circulation tube (if featured). c. Remove the seal and the ring by pulling downwards (it is held in position by an elastic ring).
6.2.6 Drain filter pump body a. Detach the hoses. b. Remove the screw which secures it to the crosspiece. c. Push it towards the interior of the appliance. d. Lift it up (as indicated by the arrow) and remove. e. While re-assembling, pay attention that the rubbers are positioned correctly.
Access from the rear panel a. Remove the screws which secure the rear panel to the back side of the cabinet. From the rear panel it is possible to access to: b. Belt c. Pulley d. Heater e. Motor Circulation pump (if featured) g.
6.3.3 Motor a. Detach the wiring connectors. b. Remove the rear screws which secure the motor and loosen the front screws. c. Loosen the motor from the supports. d. Remove the front screws and remove the motor. 6.3.4 Heating element e.
Access from the bottom of the appliance 6.4.1 Damper a. Press the locking key and at the same time remove the pin using pliers. b. Remove the damper from the support. When re-assembling: Check that the pin is not damaged; if so, replace it. Check that the anchor tabs protrude correctly.
Washing group a. Remove the work top. b. Remove the rear panel, detach the hoses from the tub (dispenser-tub), detach the connectors from the heating element and from the NTC sensor, remove the belt and the motor (to lighten the tub). c.
6.6.1 Drum shaft bearings If it is necessary to replace the bearings, the engineer may: Replace the rear tub shell complete with bearings and sealing ring. Replace the bearings and the sealing ring only. In the latter case: a. Remove the tub and the drum from the appliance. b.
Drum lifter The drum lifter can be removed from the interior for tubs G19 G20 G22. Removal a. Insert a screwdriver into the nearest hole of the drum lifter centre. b. Bend the drum anchor tabs as shown in the figure.
7 TOOLS AND MATERIALS Standard tools 1. Set of standard flat-head screwdrivers (small, medium, large). 2. Set of cross-head ("Phillips") screwdrivers. 3. Set of socket screws (7, 8, 10, 13, 15, 17mm). 4. Insulated scissors. 5. Allen keys (5-6 mm). 6.