20
GB
INSTALLATION
14.4
descaling
»
Remove loose scale deposits from the water heater.
»
If necessary, descale the inner cylinder with commercially available descaling agents.
»
Only descale the flange after disassembly and never treat the cylinder surface and protective anode
with descaling agents.
14.5
installing the temperature limiter
26
_0
2_0
7_0
30
5
1
1 Limiter sensor
»
Insert the limiter sensor into the sensor well as far as it will go.
15
trOuBleshOOting
note
The high limit safety cut-out can respond at temperatures below –15 °C.
the appliance
may be subjected to these temperatures during storage or transport.
»
Display the fault code (see chapter "Settings / Menu functions / Displaying the fault code").
»
The plugs are described in chapter "Specification / Wiring diagrams and connections".
fault
code cause
»
remedy
The heat-up time is very long
and the heat-up symbol lights
up.
The flanged immersion heater is
scaled up.
Descale the flanged immersion heater.
The safety valve is dripping and
the heat-up symbol does not
light up.
The valve seat is contaminated.
Clean the valve seat.
The display flashes.
E2
The temperature sensor is faulty.
Check whether plug X10 is properly
inserted.
E4
Check the temperature sensor.
E1
28
Communication between the elec-
tronic assemblies for control unit
and operation is faulty.
Check whether plugs X2 are inserted
properly in both assemblies.
Check the assemblies and the con-
necting cable.
The water does not heat up.
The heat-up symbol does not
appear.
The display flashes.
E8
The high limit safety cut-out has
responded.
Check the appliance and eliminate the
cause.
Press the reset button (see diagram).
The high limit safety cut-out has
responded because the thermostat
is faulty.
Remedy the cause of the fault. Replace
the high limit safety cut-out.
The high limit safety cut-out has re-
sponded because the temperature
has dropped below -15 °C.
Press the reset button (see diagram).
The flanged immersion heater is
faulty.
Replace the flanged immersion heater.
The water does not heat up.
The display flashes.
E6
The temperature sensor is faulty.
Check whether plug X10 is properly in-
serted. Check the temperature sensor.
