Miele G 7881 Service Manual

							3 Fault Repair
3.1 No Water Intake
Symptom
Water intake only starts after rotation of the circulation pump has been registered;
see 050 2.4 Circulation Pump M6.
Cause
Circulation pump is not running.
Remedy
ACheck the circulation pump for power or mechanical failure.
ASpeed Sensor B3/9 Check, 050 4.1.
Cause
WaterProof System (WPS) valve does not open.
Remedy
ASee fault codeF 0Ein 070 2.11.2 Intake/Drain Fault LED and/or 070 Table 51.
3.2 Minimum/Maximum Number of Flow Meter Pulses Not Achieved
Cause
Flow meter clogged by limescale.
Remedy
AFlow Meter (Cold Supply Water) Replacement, 041 4.3.
x
Note
The flow meter is behind temperature limiter F2.
Cause
Reed switch defective.
Descriptive Technical Documentation
041-14 DTD no. 62-7881
This information should not be duplicated or passed on without Miele approval. All rights reserved. 18.09.2013, US_am 
						

							Remedy
ACheck the reed switch for correct operation and seating.
ACheck the reed switch connections and plugs.
AIf necessary, replace the reed switch; see Reed Switch (Supply Water Flow
Meter) Replacement, 041 4.2.
Descriptive Technical Documentation
DTD no. 62-7881 041-15
18.09.2013, US_am This information should not be duplicated or passed on without Miele approval. All rights reserved. 
						

							4 Service
4.1 Reed Switch B8/2 (Salt Container Float Switch) Replacement
AService Panel Removal, 022 4.2.
ADisconnect the plug connection from the reed switch.
AUse needlenose pliers to remove the circuit board (PCB) with reed switch
from the salt container.
ASlide the PCB with the new reed switch into the holder until it clips into
position.
AReconnect the plug connection.
4.2 Reed Switch (Supply Water Flow Meter) Replacement
AService Panel Removal, 022 4.2.
x
Note
The flow meter is behind temperature limiter F2.
ADisconnect the plug connection from the reed switch.
AUse needlenose pliers to remove the circuit board (PCB) with reed switch
from the flow meter.
ASlide the PCB with the new reed switch into the holder until it clips in position.
AReconnect the plug connection.
Descriptive Technical Documentation
041-16 DTD no. 62-7881
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							4.3 Flow Meter (Cold Supply Water) Replacement
AService Panel Removal, 022 4.2.
ARemove the screws securing temperature limiter F2 (030 Fig. 3, Pos. 2).
ACarefully lift the temperature limiter slightly.
ASlide the flow meter up and out of its holder on the water softener.
ADisconnect the plug connection from the reed switch and disconnect the
hoses.
AInstall the new flow meter by following these instructions in reverse order.
4.4 Water Diverter Removal
ARemove the right-hand side panel (Side Panel Removal, 010 4.1).
AUnclamp all hoses from the diverter.
AUnclip the diverter from the inside of the cabinet and from the mounting
bracket on the outside of the machine.
Descriptive Technical Documentation
DTD no. 62-7881 041-17
18.09.2013, US_am This information should not be duplicated or passed on without Miele approval. All rights reserved. 
						

							042 Demineralized-Water Intake
x
Descriptive Technical Documentation
DTD no. 62-7881 042-1
18.09.2013, US_am This information should not be duplicated or passed on without Miele approval. All rights reserved. 
						

							1 Technical Data
Solenoid Data
Valve VoltageFlow
PressureFlow RateConnection
Length
1)Threaded
Union
Demineraliz-
ed water
(Y20)1N AC 220/240 V
50/60 Hz21.8 - 145
psi (1.5 - 10
bar)
2)
2.1 gal/min (7.5
L/min)5.6' (1.7 m) 3/4"
Table 1:WaterProof System Data (as per Parts CD)
1)The standard WaterProof system hose can be replaced with a 14.8-foot (4.5-meter) version.2)With a pressure of 7.3 to 21.8 pounds per square inch (0.5 to 1.5 bar), the water intake time is
automatically extended by up to 5 minutes.
x
Drain Pump - Demineralized Water
Type VoltagePower
RatingMax. Head
HeightMax. Flow
RateWinding
Protection
BE24B4–0871N AC 230/240 V
50 HzApprox.
85VA3.3' (1m)2.6 gal/min
(10L/min)Integrated
Table 2:Drain Pump, Installed in Demineralized Water Intake
Descriptive Technical Documentation
042-2 DTD no. 62-7881
This information should not be duplicated or passed on without Miele approval. All rights reserved. 18.09.2013, US_am 
						

							050 Drainage, Sump, Circulation Pump
Descriptive Technical Documentation
DTD no. 62-7881 050-1
18.09.2013, US_am This information should not be duplicated or passed on without Miele approval. All rights reserved. 
						

							1 Technical Data
Type VoltagePower
RatingMax. Flow
PressureMax. Flow RateWinding
Protection
Drain
pumpBE28B31N AC 200/
220 V 60HzApprox.
80 VA—min. 4.2 gal/min
(16 L/min)Integrated
Circulation
pumpMPE 11–
64/21N AC 220V
60HzApprox.
600 VA13 psi (0.9
bar)106 gal/min (400
L/min)Integrated
Table 1:Pump Data (as per Parts CD)
Descriptive Technical Documentation
050-2 DTD no. 62-7881
This information should not be duplicated or passed on without Miele approval. All rights reserved. 18.09.2013, US_am 
						

							2 Function
2.1 Sump and Associated Components
x
Fig. 1:Sump and Associated Components
1 Float switch holder
2 Drain pump, M8
3 Heater level switch, B1/10
4 Circulation pump, M6
5 Speed sensor, B3/9
6 Water intake level switch, B1/1
7 Float switch housing
8 Float switch, B8/3
9 Float
Descriptive Technical Documentation
DTD no. 62-7881 050-3
18.09.2013, US_am This information should not be duplicated or passed on without Miele approval. All rights reserved. 
						

							2.2 Drainage
The machine comes supplied with a 5-foot, flexible drain hose (7⁄8-inch inner
diameter). In non-CD models, the steam condenser is drained internally through
the existing drain hose. The machine has a removable non-return valve. The drain
height should not exceed 3 feet. Floor drains are permissible; additionally, the
drain hose may be lengthened to 13 feet.
2.3 Drain Pump M8
Drain pump M8 (050 Fig. 1, Pos. 2) is located below the cabinet and is connected
to the right of the sump. It is controlled directly by the electronic (070 Fig. 5, Pos.
17). It pumps out wash water from the lowest point in the sump via a non-return
valve and sends the water via the drain hose to the on-site drain. A vent is
provided to prevent siphoning.
2.4 Circulation Pump M6
Circulation pump M6 (050 Fig. 1, Pos. 4) takes in the wash water from the side of
the sumpthroughthe filter combination (030 2.4 Filter System), and pumps it to
the spray arms. Before each water intake, the circulation pump is checked via a
start routine. There are up to 3 start attempts (each lasts about 2 to 3 seconds)
with different voltages. If the speed sensor still does not register any rotation after
the third attempt, the WPS valve is not opened and fault codeF 08(070 Table 51)
is displayed.
2.5 Speed Sensor B3/9, Gentle Start of Circulation Pump
The circulation pump is equipped with a speed sensor (050 Fig. 1, Pos. 5) that
continually monitors the pump speed and sends appropriate signals (8 pulses per
revolution) to the electronic. Here these signals are evaluated and the circulation
pump speed is adjusted as necessary to achieve the desired speed (reduced/full
speed).
Pulse measurements at the speed sensor are not expected to be made. An open
circuit in one of the sensor connections or a blocked circulation pump will cause
fault codeF 08(070 Table 51) to be displayed.
Descriptive Technical Documentation
050-4 DTD no. 62-7881
This information should not be duplicated or passed on without Miele approval. All rights reserved. 18.09.2013, US_am