Miele G 7881 Service Manual

							2.3 Temperature Limiter F2 (Thermostat) 329°F (165°C)
Temperature limiter F2 is connected electrically in series between the heating
connection and the two heater relays, 1K1/1 and 2K1/1. Its capillary tube is
located in the cabinet on heater elements R2 and R3. The temperature limiter
cuts out when the heater element's external temperature rises above 329°F
(165°C). After the temperature has dropped, the limiter doesnotreset
automatically. It must be manually reset. See Resetting Temperature Limiter F2
(Thermostat), 030 4.2.
x
Warning!
Before the temperature limiter is reset, it is essential to allow the heater elements
to cool and to establish why the limiter tripped.
During a heating step, the electronic checks whether the set wash temperature is
reached. If the desired temperature is not achieved within 60 minutes, e.g., due to
a heater element open circuit, then a fault code indicating“Temperature not
reached”will be displayed. Depending on the wash block in question, this fault
code can be F01, F02, F03, F18, F19, or F27
2.4 Filter System
A four-filter combination consisting of a coarse filter, fine filter, microfine filter, and
large surface area fine filter.
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030-4 DTD no. 62-7881
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Fig. 2:Filter Combination
1 Coarse filter
2 Fine filter
3 Microfine filter, mesh size 0.01”(0.25mm)
4 Large surface area fine filter, perforation diameter 0.04”(1mm)
The circulating wash water is filtered via 2 parallel paths. A portion of the water
flows through the central opening of the coarse filter and then passes through the
microfine filter. The remainder passes directly through the large surface area fine
filter (030 Fig. 2, Pos. 4). All water is then mixed together again in the sump,
where it is taken in by the circulation pump, and the process repeats. In this way
some of the water passing through the filter system always passes through the
microfine filter so the soil particles in the suds are continually being reduced. Soil
that is retained by the microfine filter either collects there or falls onto the filter cap
where it will eventually be removed by the drain pump. During the drainage a
large portion of the suds passes through the microfine filter in reverse direction of
flow (outside to inside) and thus cleans the filter.
Descriptive Technical Documentation
DTD no. 62-7881 030-5
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							3 Fault Repair
3.1 Temperature Limiter F2 (Thermostat) Has Cut Out
Cause
The heater relay contacts (1K1/1 or 2K1/1) have fused together.
Remedy
ACheck the heater relay contacts for continuity when they are not activated.
AIf continuity exists, replace the appropriate relay. See Heater Relay Removal,
080 4.2.
Cause
Excessive foam developed in suds.
Remedy
ACheck the quantity of rinse aid dispensed.
AUse a different rinse aid.
3.2 Repetitive Heater Element Fault in Cabinet
Symptom
Short circuit and/or body contact at heater elements in cabinet.
Cause
Over long periods of time, excessively foaming suds may cause the heater
elements to fail. May be caused by non-Miele-approved detergent. A check can
be made during washing by using the clear door.
Remedy
AReplace the heater element. See Heater Element Replacement, 030 4.5.
AUse only detergents recommended by Miele.
Descriptive Technical Documentation
030-6 DTD no. 62-7881
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							4 Service
4.1 Checking the Heater Element
AService Panel Removal, 022 4.2.
AToekick Removal, 010 4.6.
ACheck the heater elements for continuity at temperature limiter F2. Measure
from contacts 32, 22 or 12 for one heater element in each case to neutral (star
point, 080 Fig. 5, Pos. 1).
x
Note
This only applies to star-formation connections with 3N AC. It does not apply if
the heater elements are connected in delta formation.
4.2 Resetting Temperature Limiter F2 (Thermostat)
x
Danger!
Whenever the toekick is to be removed it isessentialto disconnect the machine
from the power supply. If the temperature limiter reset button should fall off, the
contacts thus exposed will have supply voltage applied to them!
ARemove the service panel.
AFirmly press in the red-brown button on the right side.
4.3 Replacing Temperature Limiter F2 (Thermostat)
x
Warning!
To avoid instability, the connecting strip (010 Fig. 8, Pos. B) behind the toekick
must never be loosened or removed.
Descriptive Technical Documentation
DTD no. 62-7881 030-7
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							Fig. 3:Safety Thermostat AFK3 G-A (Stiebel Co.), F2
AService Panel Removal, 022 4.2.
AToekick Removal, 010 4.6.
ADisconnect the connection plugs.
ARemove the retaining screws (030 Fig. 3, Pos. 2, Pos. 8).
AOpen the door and release the clips holding the capillary tube onto the heater
elements (030 Fig. 4, Pos. 1).
ACarefully pull the capillary tube downwards out of the cabinet feed-through
hole (030 Fig. 4, Pos. 2).
AInsert the new capillary tube. Apply a little grease or sealant around the
cabinet feed-through hole.
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030-8 DTD no. 62-7881
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Fig. 4:Temperature Limiter Routing
Note
When reinstalling the temperature limiter, ensure that the capillary tube connects
between heater elements R2 and R3. It should not be connected to heater R1,
as R1 is used for drying.
4.4 Replacing the Capillary Tube Feed-Through Hole
ARemove the capillary tube; see Replacing Temperature Limiter F2
(Thermostat), 030 4.3.
AHold the locknut under the cabinet with a suitable wrench and loosen the
feed-through inside the cabinet.
AFor reassembly, see 030 Fig. 3, Pos. 3-7.
x
Note
During removal and reassembly, make sure not to bend or warp the cabinet
base around the feed-through.
Descriptive Technical Documentation
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							4.5 Heater Element Replacement
AOpen the door and loosen the appropriate heater element holder.
ARemove the appropriate heater element central screw in the cabinet.
ALift the heater element, complete with rubber seal, upwards to remove.
AWhen re-installing, ensure that the heater element seal completely seals the
heater element hole in the cabinet.
Descriptive Technical Documentation
030-10 DTD no. 62-7881
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							041 Hot/Cold Water Intake, Water Softener
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Descriptive Technical Documentation
DTD no. 62-7881 041-1
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							1 Technical Data
Solenoid Data
Valve VoltageFlow
PressureFlow RateConnection Hose
Length
1)Threaded Union
Cold
water
(Y1)1N AC 220/
240 V 60Hz29 - 145 psi
(2 - 10 bar)2.1 gal/min
(7.5 L/min)5.6' (1.7m) 3/4"
Hot
water
(Y12)1N AC 220/
240 V 60Hz29 - 145 psi
(2 - 10 bar)2.1 gal/min
(7.5 L/min)5.6' (1.7m) 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.
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Water Softener
Weight Without WaterCapacity with 6°d (degree of German hardness)
water hardness
Approx. 13 lbs (6 kg) Approx. 150 gal (570 L)
Table 2:Water Softener Data
Descriptive Technical Documentation
041-2 DTD no. 62-7881
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							2 Function
2.1 Water Connection
–Connection to the water supply may be made directly without the need for
additional safety measures (e.g., a non-return valve), as these machines are
built to comply with German DVGW (water authority) guidelines.
–If hot water is not available, both hoses must be connected to the cold-water
supply via a Y-piece.
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Fig. 1:3/4" Y-Piece
–The required flow pressure must be at least 10 pounds per square inch, or 0.7
bar. If pressure is below 10 pounds per square inch, then the water intake
time is automatically extended by a maximum of 5 minutes. The machine
cannot be operated if water pressure is below 7.3 pounds per square inch
(0.5 bar).
–With a static water pressure above 145 pounds per square inch (10 bar), a
pressure-reducing valve must be installed.
–The intake filter must be installed between the on-site supply and the intake
hose.
x
Warning!
In models with a steam condenser, the cold-water intake hose must not be
connected to hot water.
Descriptive Technical Documentation
DTD no. 62-7881 041-3
18.09.2013, US_am This information should not be duplicated or passed on without Miele approval. All rights reserved.