The tables below contain useful tips on troubleshooting a WMF coffee maker. There are several tables, as the WMF brand produces a wide range of coffee machines varying in structure and, therefore, requiring different approaches when it comes to troubleshooting and repair. Some of the ranges include the WMF Presto series, the 1500S, 2000S, 5000S, 8000S, 150 F coffee machines, Bistro, and more.

WMF 150 F coffee maker troubleshooting

Error patternPossible cause:Action instructions
The machine is not working.The fuse in the fuse box has been triggered. The group is loaded too heavily.Replace the fuse or reset it.
Connect the machine to a separate group.
The brewing process indicator illuminates, but no water is going into the filter.The dry-boil protection has been triggered.Reset the dry-boil protection. Safeguards; dry-boil protection.
The descale indicator illuminates.The scale deposits in the heating system exceed the set limit.Descale the machine.
The descale indicator light remains on after descaling the machine.The machine has not yet been reset.Press the program button for 6
seconds. The light will go out.
Resetting the descaling indicator light.
Steam is coming from the filter.The machine was not descaled when indicated by the descale indicator light. The wrong water setting has been applied.Descale the machine.
Setting the descaling indicator.
The coffee is too strong.Too much coffee has been placed in the filter.Reduce the amount of coffee.
The coffee is too weak.Not enough coffee has been placed in the filter.Increase the amount of coffee.
The water distributor is soiled, so that the coffee is not being completely drenched.Unscrew the water distributor and clean it.
The coffee is not hot enough.There is no lid on the jug.Use the lid.
The jug is too full or is overfl owing.The set quantity is too high.Lower the quantity.
Setting the amount of coffee.
Not enough coffee is getting into the jug.The set quantity is too low.Increase the quantity.
Setting the amount of coffee.

WMF 150 F coffee maker. Errors with error message in display

Display ErrorPossible causeAction instructions
E1Filling time error.
Machine fi lls too slowly.
The water supply is blocked
Check the water supply. Fully open the tap.
Increase the water pressure.
Switch the machine on and off.
The error report will disappear.
E2Maximum water sensor error.
E3Minimum water sensor error.
E4
E5
E6
E7
Water sensor error.
EEPROM error.
Display error.
Flow meter error.
The control unit reports a defect that
can only be resolved by a WMF service
technician. Contact WMF Service.
E8Minimum water sensor error.
Reservoir does not fi ll during
the brewing process.
Check the water supply. Fully open the tap.
Increase the water pressure. Switch the machine on and off.
The error message disappears.

WMF 1000 coffee machine troubleshooting

Error messageAction
Use brewerBrewer is not used:
Use brewer
Brewer end switchBrewer unit not inserted correctly:
Use brewing unit correctly
Brewing unit stiff:
Remove brewer, open brewing chamber with multitool,
apply a thin layer of the grease from the accessories kit
to the red seal ring
Flow fault
(water tank is empty)
Check to make sure that float in the water tank runs
smoothly and fill water tank
Bleed machine: Dispense hot water until a constant
stream of water comes out
Flow fault
(water tank is full)
Air in the system, possibly associated with loud pump
noise:
Check whether the water tank is pushed in completely
Bleed machine: Dispense hot water until a constant
stream of water comes out
no hot water dispensing:
Remove tank filter/dirt trap from tank, try again
Brewing unit stopped up:
Remove brewing unit, clean manually, insert and carry
out cleaning program if the error occurs sporadically:
set grinding degree coarser
switch off pre-brew
EEPROM Errorswitch machine on/off
If the error repeats, the fault must be eliminated by the 
WMF 1000 Service-Center.
Motor driver errorswitch machine on/off
If the error repeats, the fault must be eliminated by the 
WMF 1000 Service-Center
grinder blockedThe grinders are blocked by foreign bodies:
To eliminate,switch off machine, turn grinders
clockwise with the multitool in order to be able to
remove foreign bodies.
grinding degree too fine:
set grinding degree coarser
Temperature sensor
steam
Temperature sensor
water
switch off coffee machine, allow to cool and switch on
again
If the error repeats, the fault must be eliminated by the 
WMF 1000 Service-Center.
Timeout levelAir in the system, possibly associated with loud pump
noise:
Check whether the water tank is pushed in completely
Take milk hose out of the milk container and press the
milk foam button
if hot water comes out instead of steam:
Carry out descaling
if steam comes out:
Please call the hotline
no milk foam/milk
output, but milk in
reservoir
Check that milk hose is not kinked or crimped, lay milk hose again
Clean all-in-one spout and milk nozzle
No milk foam,
only hot milk
Put milk lever in milk foam position
Carry out foamer rinse, pushing spout completely
upwards if necessary, check whether the air intake nozzle of the
all-in-one spout is stopped up
Milk or milk foam
is too cold
Ensure that the milk nozzle is on the milk hose
Check whether the correct milk nozzle is mounted
(transparent for refrigerated milk)
Milk is too hot and there
is too little or
milk foam has bubbles
Milk is too warm:
Refrigerate milk
Check that milk hose is not kinked or crimped
lay milk hose again
Check whether the correct milk nozzle is mounted
(grey for unrefrigerated milk)
leakage:
Check all connections and seals of the all-in-one spout
Milk lever is not all the way up for milk foam or not all
the way down for milk
All-in-one spout:
Assembly/disassembly
is stiff
lightly smear o-rings with WMF sealing grease and
make sure that no grease gets into the air intake
opening
Water tank stifflightly smear O-rings with WMF sealing grease
Display side doors openBrewing unit is not inserted correctly or doors are not
closed correctly - check! The lever labeled "Press" must
always be in the level position.
Pump makes loud
noises
Water tank is not inserted correctly (air in the system).
Push water tank in completely
Bleed machine:
Dispense hot water until a constant stream of water
comes out
Coffee has no cremeUnsuitable coffee mixture or coffee is not fresh
Quantity of ground coffee is set too low
Cups too cold: pre-warm
Brewing temperature too low: increase temperature
grinding degree too coarse: set grinding degree finer
Brewing unit can no
longer be pulled out or
inserted
Brewing unit is not in the basic setting
Close the right side door and switch machine on
The brewing unit can be adjusted using the multitool
until the brewer can be inserted

WMF 1500S, 2000S, 5000S, 8000S coffee machine error codes

Error
number
Error
description
Action instructions
6Brewing unit
lockup current /
Brewing unit stiff
Switch off the coffee machine.
Clean the brewing unit.
26

36

(9516 for WMF 5000S)
Right grinder
blocked

Left grinder
blocked
Switch off the coffee machine
Disconnect mains plug
Remove bean hopper
Rotate the grinder disk counterclockwise only by
using the multitool for the hopper
(two pins must be inserted in the corresponding
recesses on the grinder; see illustration)
Replace hopper
Switch on coffee machine
If this occurs frequently:
Set grinding degree one stage coarser
88Boiler:
over-temperature
Switch off the coffee machine, allow to cool and
switch on again
If error not remedied
Switch off the coffee machine
Call WMF Service
89Boiler:
heat-up time error
Switch off the coffee machine and on again
If error not remedied call WMF Service
161Flow error:
brewing water
Clean the brewing unit
Set grinding degree coarser
Reduce quality
If error not remedied call WMF Service
162Flow error:
when cleaning
Between each of the following steps switch off the coffee machine and on
again. If error not remedied carry out the next step.
Clean the brewing unit
If error not remedied call WMF Service
163Flow error:
warm rinsing
Between each of the following steps switch off the coffee machine and on
again. If error not remedied carry out the next step.
Clean the brewing unit
If error not remedied call WMF Service
186Steam boiler:
level
Beverage dispensing temporarily blocked.
Check that grounds container is correctly
inserted
Switch off the coffee machine and on again
188Heater errorSwitch off the coffee machine, disconnect mains
plug
Call WMF Service
189Steam boiler:
heat-up time error
Switch off the coffee machine and on again
If error not remedied call WMF Service

WMF 1500S, 2000S, 5000S, 8000S coffee machine troubleshooting

Error patternAction instructions
No hot water
dispensing but water in
grounds container
Clean hot water spout
Call WMF Service (coffee dispensing possible)
No Choc dispensing
but water in grounds
container
Do not use Choc dispensing
Call WMF Service (coffee dispensing possible)
Choc portion
controller blocked,
Choc dispensed only
with water
Clean portion controller
Empty powder
Turn dosing auger manually until all powder is
removed
If necessary rinse with water
(Allow to) dry completely
Coffee dispensing on
the left / right differs
Clean the combi spout
No milk foam /
milk output, but milk
in milk container
Check whether the milk hose is kinked or squashed
Re-route milk hose correctly
Clean the combi spout
Check whether milk nozzle is blocked
Check whether milk cooler is iced
Milk foam not OK
Temperature too cold
or too hot
Change milk nozzle
Use a suitable milk nozzle on the combi spout.
Milk nozzle 3 kW
• Very cold milk (up to 8 °C)
• Chilled milk (8 to 12 °C)
• Non-chilled milk (above 12 °C)
Clean the combi spout
If error not remedied
Use another milk nozzle from the accessories
The milk foam
dispensing spits
strongly
Milk too hot
Check whether the milk system has been cleaned
Clean the milk system
Check whether the milk has been cooled
sufficiently
No powder beverage
dispensing
Clean the mixer bowl
Is the hose kinked?
Perform milk cleaning and rinsing oftener, if
necessary daily
Dose less powder
Dose more water
Pump runs
continuously, water in
grounds container
Switch off the coffee machine and on again
If error not remedied call WMF Service
Milk foamer assembly
and disassembly stiff
Lightly smear the O-rings with WMF gasket grease
Choc hopper cannot be
replaced
Manually turn the drive for the dosing auger at the
portion controller slightly in a clockwise direction
Check whether Choc hopper is accidentally locked
Bean hopper cannot be
replaced
Check whether bean hopper is accidentally locked

WMF Presto display error messages

WMF Presto coffee machine Display messages

WMF Presto coffee machine error codes

Report
display
Descr.Comment
2 Brewer without
electricity
5Brewer shutoff
6Brewer over current
7Brewer timeout (no
electricity
26Portioner current
malfunction
36Current malfunction
Portioner
46Current malfunction
Portioner 3
not implemented
87Boiler sensor
damaged
88boiler excess
temperature
89boiler heating time
130General current
malfunction
Short circuit if
immediately at
switching-on
4/30 V present
149General voltage
malfunction
If short circuit is present
in 4/30V systems
161Flowmeter
malfunction during
brewing
162Flowmeter
malfunction during
cleaning
163Flowmeter
malfunction during
checking
164Flowmeter
malfunction during hot
water dosage
165Flowmeter
malfunction during choc
dosage
166Flowmeter
malfunction during DK
feeding
167Flowmeter
malfunction during
descaling
186Timeout during
steam boiler filling
187Steam boiler sensor
damage
188Excess temperature
in steam boiler
189Heating-time steam
boiler
9061Standby EventComing and going
906Reset Event!Coming and going
9104Timer function not
possible
Machine cannot switch
off due to cleaning in
progress
Fifo was deleted
Defaults into RAM
Cleaning was interrupteddue to an error in the
cleaning program
Machine cleaning in
progress
internal
Milk foam cleaning in
progress
internal
AD-transformer ready!
(for developers only)
internal
948Malfunction in level
sensor
956Auto detect malfunction:
Right grinder not
detected
957Auto detect malfunction:
brewing-valve not
detected
958Auto detect malfunction:
Oscillating pump not
detected
959Auto detect malfunction:
Release valve not
detected
969Auto detect malfunction:
Fan not detected
961Auto detect malfunction:
Hot water dispensing
valve not detected
96Auto detect malfunction:
Mixer not detected but
choc/topping portioner
detected
963Auto detect malfunction:
choc/topping portioner
not detected but mixer
detected
964Auto detect malfunction:
Mixer valve detected
but no powder portioner
detected or; Hot
water-Choc/topping
valve not detected but
choc/topping portioner
detected
965Auto detect malfunction:
Milk pump detected
but no cappuccino
valve detected or milk
pump not detected
but cappuccino valve
detected
Power supply reports
voltage too low
External mains voltage
Pump switches to
pressure -lowering mode
(Info = button number)
Pump pressure lowered.
The beverage number is entered
into the laptop Info column
975Reset triggered by
customer
988MDB communication
error coin checker
989MDB communication
error card reader
990MDB communication
error banknote reader
9914 V are switched off and
then on again (reset for
MDB equipment on 4 V)

WMF Bistro coffee machine error codes

Error
number
Error descriptionAction instruction
24Motor blockedAll associated brews barred. Note hopper switchover!
Tap on beans hopper
The beans may slide down and the light barrier is touched.
34Motor blockedAll associated brews barred. Note hopper switchover!
Tap on beans hopper
The beans may slide down and the light barrier is touched
186Steam boiler filling time.Steam dispensing barred, milk foam barred.
Machine Off-On; note heating display for
information for the WMF Service !
Water tap open?
189Heating time of the steam
boiler.
Heating off, steam dispensing barred.
Machine Off-On
Check local fuses
130General current error.Machine Off-On
Switch off lighting (>adjust), all colours to zero
Allow the machine to cool off and try again
Call the WMF Service if the error occurs again
148Current error on the steam boiler vent valve.One can continue to use the machine; dosing fluctuations can occur
for milk meterings.
Confirm steam dispensing or milk dispensing
from time to time
Call the WMF Service
131Power supply error on the
hot water valve.
The hot water dispensing is barred: One can continue to use the
machine. Do not use hot water anymore.
Call the WMF Service
132Current error on cold water mixing valve, hot water valve.Hot water dispensing is barred: One can continue to use the machine.
Do not use hot water anymore.
Call the WMF Service
137Current error on mixer/valveBarr on beverage mixer: One can continue to use the machine. Do
not use choc anymore.
Call the WMF Service
140Current error on steam
valve 1
Steam dispensing is barred: One can continue to use the machine. Do
not use steam dispensing or Steampower.
Call the WMF Service
141Power supply error on steam valve 2Steam dispensing is barred: One can continue to use the machine. Do
not use steam dispensing or Steampower.
142Power supply error on the
cap. valve 1
Milk beverages are barred: The machine can be used except for milk
beverages. If installed use steam dispensing for foaming.
143Power supply error on the
cap. valve 2
Milk beverages are barred: The machine can be used except for milk
beverages. If installed use steam dispensing for foaming.
Call the WMF Service
134Power supply error on
brewing valve for cold water
One can continue to use the machine. Coffee beverages may be
brewed too hot.
Call the WMF Service
149General power supply errorMachine Off-On
Allow the machine to cool off and try again
If the error occurs again:
Call the WMF Service
161Flow errorWater tap opened!
Machine Off-On
Perform cleaning and try again
Coffee dispensing on the
left/right differs
Clean the combi spout
No milk foam/no milk
dispensing, although there is milk in the hopper
Check whether the milk hose is kinked or squashed
Lay milk hose correctly
Clean the combi spout
Milk nozzle blocked?
Pinch valve turned to strongly?
Milk foam not OK,
temperature too low
Change milk nozzle:
- green milk nozzle for use of cooled milk
- white or brown milk nozzle for uncooled milk
Clean the combi spout
Close pinch valve
The milk foam dispensing
spits strongly
Milk to hot
Use white or brown milk nozzle
Set foam quality lower
Clean milk cleaning system
Open pinch valve
No illumination
No display
No tone when pressing a button
Pull out drip tray
Check the fuse behind the drip tray
Pull out mains plug!
Replace fuse
Only fuse F4A is permissible