Miele G 7881 Service Manual
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4 Service 4.1 Coarse Filter Replacement AOpen the detergent pullout drawer. ALoosen the two upper retaining screws (095 Fig. 3, Pos. 1) and tilt them upwards. ATilt the coarse filter housing (095 Fig. 3, Pos. 2) forwards and lever it free of the lower retainers (095 Fig. 3, Pos. 3). APress down on the center tab to open the door of the filter housing and remove the perforated plate. ARemove the coarse filter and install a new one. The smooth filter surface must face towards the rear. AInstall the perforated plate in place at the bottom and press it into position at the top. AReplace the coarse filter housing, ensuring that it is correctly seated in its lower retainers. AClose the detergent pullout drawer. x Fig. 3:Coarse Filter Housing Removal Descriptive Technical Documentation DTD no. 62-7881 095-3 18.09.2013, US_am This information should not be duplicated or passed on without Miele approval. All rights reserved.
4.2 Removing Potentiometer 1R32 AOpen the left drawer. ARemove the drying unit fascia retaining screws, 095 Fig. 2, Pos. 4. ARemove the drying unit fascia. Disconnect the connection plug for the potentiometer, 095 Fig. 2, Pos. 2. ARemove the holder bracket with potentiometer. ARemove the potentiometer locknut. AReassemble by following these instructions in reverse order. 4.3 Removing the Drying Unit Container x Fig. 4:Drawer Guide with Lever ADisconnect the unit from the power supply. AClose the door. AFully open the left drawer with drip tray. ARemove storage containers. ARemove the side holding bracket, 093 Fig. 1, Pos. 1. ANow pull out the drawer further until the locking levers, 095 Fig. 4, Pos. 1, in the guide runners are visible. ALift the lever in the right guide upwards and press the lever in the left guide downwards and pull out the drawer to its end stop. ARemove the left retaining screw, 095 Fig. 2, Pos. 1, from the drying unit. APull out the drying unit container halfway and disconnect the top plug connection (connector X5/2), 095 Fig. 5, Pos. 1. ARemove the drying unit container. AReassemble by following these instructions in reverse order. Descriptive Technical Documentation 095-4 DTD no. 62-7881 This information should not be duplicated or passed on without Miele approval. All rights reserved. 18.09.2013, US_am
4.4 Microfine Filter Replacement x Fig. 5:Drying Unit Container with Filters AOpen the detergent pullout drawer. ARemove the coarse filter housing as outlined in Coarse Filter Replacement, 095 4.1, Steps 2 and 3. ARemove the microfine filter. See 095 Fig. 5. Install a new microfine filter. x Note When re-installing, ensure that the filter rubber seal is properly seated on the holder in the drying unit container. To secure the filter turn both retainers simultaneously towards the filter. AReplace the coarse filter housing, ensuring that it is correctly seated in its lower retainers (095 Fig. 3, Pos. 3). AClose the detergent pullout drawer. AFill out the sticker and attach it in the appropriate place. Descriptive Technical Documentation DTD no. 62-7881 095-5 18.09.2013, US_am This information should not be duplicated or passed on without Miele approval. All rights reserved.
096 Drying Unit, Electrical Details G 7882 CD, G 7883 CD 1 Technical Data x Stage 1 (basic load) 700W Stage 2 (controlled load) 1100W Table 1:Heater Bank R16 Data Descriptive Technical Documentation DTD no. 62-7881 096-1 18.09.2013, US_am This information should not be duplicated or passed on without Miele approval. All rights reserved.
2 Function 2.1 Fan Motor M2 The fan is a 240VAC series-wound motor with brushes. The maximum speed is 23000 rpm. A thermal cut out for winding protection is integrated in the motor, and will reset automatically a few seconds after it has tripped.The brushes and winding protection cannot be replaced separately.When the brushes are worn out (after approximately 2500 hours of operation), the motor remains stationary and must be replaced. 2.2 Fan and Heater Bank Control add pic 6002991 1 Position of terminal block X5/2 2 Relay 1K1/3 3 Relay 2K1/3 Position of Terminal Block and Relays x Fig. 1:Electronic Components in the Drying Unit 1 Interference suppression capacitor, Z1 2 Connection plug to heater bank 3 Potentiometer 4 Electronic relay, K1/1 5 Fan speed module N1 with connection to fan motor 6 Relay plug (wiring harness) 7 Relay holder 8 Relay Descriptive Technical Documentation 096-2 DTD no. 62-7881 This information should not be duplicated or passed on without Miele approval. All rights reserved. 18.09.2013, US_am
x Fig. 2:TA-7 Drying Unit Control Wiring Diagram The control for the fan and heater bank is under the base insert of the drying unit container. The live supply L for fan M2 and heater bank R16 is from terminal 1 of plug connector X5/2 via the make contact of relay 1K1/3. The 2-stage heater bank, 096 Fig. 7, Pos. 2, has a basic and a controlled load (heater element). The basic load is activated via electronic relay K1/1. Temperature limiter F2 limits the heater power of the heater bank. It trips and opens the heating circuit at approximately 284°F (140°C) and resets and switches back on when the temperature has cooled to approximately 257°F (125°C). x Note The order of individual plug contacts at plug connector X5/2, 095 Fig. 5, Pos. 1, shown in the wiring diagram does not represent the real situation. The actual reference point is plug contact 8, the green-yellow ground lead. From here the plug contacts are numbered in descending order (7, 6, 5, and so on). Descriptive Technical Documentation DTD no. 62-7881 096-3 18.09.2013, US_am This information should not be duplicated or passed on without Miele approval. All rights reserved.
3 Fault Repair 3.1 Drying Unit Fan and Heater Bank Inoperative Cause Supply voltage not present at plug contacts 1 and 2 (plug connector X5/2). Remedy ACheck the voltage supply to the drying unit at plug connector X5/2, plug contacts 1 (L) and 2 (N). AIf no voltage is present, check other plug contacts and connections in accordance with the wiring diagram. L1 and N are applied to the drying unit via main switch S2 and door switch 1S4. Cause Relay 1K1/3 not activated. Remedy AIn the service mode, 070 2.9.4S 24, Checking Outputs 12 - 19, check output 16. Supply voltage must now be present between contacts 3 (L) and 2 (N) of the plug connector X5/2. AIf no voltage is present, see No Voltage for Relay Solenoid 1K1/3 in Drying Unit (TA), 080 3.1. AIf voltage is present, remove the base insert; see Replacing Electronic Components Under the Base Insert, 096 4.3. ACheck relay 1K1/3, 096 Fig. 1, Pos. 2 (contacts, continuity, solenoid, etc.). AReplace the relay, if necessary. Descriptive Technical Documentation 096-4 DTD no. 62-7881 This information should not be duplicated or passed on without Miele approval. All rights reserved. 18.09.2013, US_am
3.2 Drying Unit Fan Does Not Start Cause Fan motor winding defective. Remedy ASee Replacing Electronic Components Under the Base Insert, 096 4.3. ACheck motor winding for continuity with an ohmmeter. AReplace the fan, if necessary. Cause Fan motor brushes worn out (life approximately 1000 hours). Remedy AFan Motor Removal, 096 4.1. Cause Fan thermal cutout defective. Remedy AFan Motor Removal, 096 4.1. Cause Speed control N1 defective. Remedy ARemove the base insert; see Replacing Electronic Components Under the Base Insert, 096 4.3. ADisconnect the two fan connections, 096 Fig. 1, Pos. 5, at the speed control. AConnect the fan directly to the power supply between interference suppression capacitor Z1, 096 Fig. 1, Pos. 3, and the speed control. If the fan operates, the speed control is not in order. AReplace the speed control. Descriptive Technical Documentation DTD no. 62-7881 096-5 18.09.2013, US_am This information should not be duplicated or passed on without Miele approval. All rights reserved.
3.3 Drying Unit Fan Operates Too Slowly Cause Potentiometer 1R32 defective or plug connections open-circuited. Remedy ACheck the potentiometer and its connections; see Removing Potentiometer 1R32, 095 4.2. AReplace the potentiometer, if necessary. 3.4 Air From Drying Unit Is Not Warm Symptom Heater bank in drying unit container inoperative. Cause Thermostat has no continuity. Remedy ACheck thermostat for continuity with an ohmmeter; see Replacing Heater Bank Thermostat F2, 096 4.5. AReplace the thermostat, if necessary. Cause Heater bank defective. Remedy ACheck heater bank for continuity with an ohmmeter; see Removing Heater Bank R16 from the Drying Unit, 096 4.4. AReplace the heater bank, if necessary. Cause Relay 2K1/3 (basic load) not activated. Remedy AIf no voltage is present, disconnect plug 13 and check output 14 in service mode, 070 2.9.4S 24, Checking Outputs 12 - 19. AIf voltage is still not present, check the voltage supply for EZL 081 via main switch S2 and door contact switch 1S4 at plug 13, contact 3 (L1) and 4 (N). Descriptive Technical Documentation 096-6 DTD no. 62-7881 This information should not be duplicated or passed on without Miele approval. All rights reserved. 18.09.2013, US_am
AIf voltage is present, remove the base insert; see Replacing Electronic Components Under the Base Insert, 096 4.3. ACheck relay 2K1/3, 096 Fig. 1, Pos. 6 (contacts, continuity, solenoid, etc.). AReplace the relay, if necessary. 3.5 Drying Temperature Not Reached Cause Relay K1/1 (controlled load) not activated. Remedy AIf no voltage is present, disconnect plug 13 and check output 14 in service mode, 070 2.9.4S 24, Checking Outputs 12 - 19. AIf voltage is still not present, check the voltage supply for EZL 081 via main switch S2 and door contact switch 1S4 at plug 13, contact 3 (L1) and 4 (N). AIf voltage is present, remove the base insert; see Replacing Electronic Components Under the Base Insert, 096 4.3. ACheck relay 1K1, 096 Fig. 1, Pos. 1 (contacts, continuity, solenoid, etc.). AReplace the relay, if necessary. 3.6 Poor Drying Results Cause Jammed non-return flap. Remedy ARemove the air duct. ACheck that the spring-loaded non-return flap is not jammed. It must open and close easily. Cause Too little air throughput. Remedy ASee Drying Unit Fan Operates Too Slowly, 096 3.3 or Air From Drying Unit Is Not Warm, 096 3.4. Descriptive Technical Documentation DTD no. 62-7881 096-7 18.09.2013, US_am This information should not be duplicated or passed on without Miele approval. All rights reserved.