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3.2
Explanation of service functions
0.0 Last fault
The last fault can also be recalled for servicing pur-
poses when the appliance is functioning correctly.
To delete the stored fault:
B Delete fault (no fault displayed).
B Press the
button.
B Use the
or
B Press the
button.
If a list of the last 10 indicated faults is required for serv-
icing purposes, look under Settings -> Service -> Fur-
ther options -> Fault history.
0.1 Flow NTC
The temperature measured by the NTC sensor on the
CH flow pipe is indicated.
0.2 Hot water NTC
The temperature measured by the NTC sensor on the
plate-type heat exchanger outflow is indicated.
0.3 Storage tank NTC 1
Indirectly heated heat store (SO..., SK..., ST...):
The temperature measured by NTC sensor 1 in the heat
store is indicated.
Stratified-charge tank (ST...S):
The temperature measured by NTC sensor 2 at the bot-
tom of the heat store is indicated.
0.4 Storage tank NTC 2
Stratified-charge tank (ST...S):
The temperature measured by NTC sensor 2 at the top
of the heat store is indicated.
1.2 Code plug
The 10-digit part number of the code plug is indicated.
The code plug determines the appliance functions. If
the appliance is converted from natural gas to LPG or
vice versa (using conversion kit) the code plug also has
to be changed.
1.5 Desired flow temp.
The CH flow temperature demanded by the text display
module or a programmer connected to the bus module
is displayed.
1.9 Module detection
The text display module shows the modules detected
by the appliance.
2.0 Operating mode
There are 3 operating modes to choose from.
• Normal mode: the appliance operates according to
the commands received from the programmer.
7 181 465 347 (01.07)
button to select yes.
• Min mode: the appliance runs constantly at minimum
output.
The text display shows MIn mode. The 2-digit dis-
play alternates between the CH flow temperature
and
.
– –
• Max mode: the appliance runs constantly at maxi-
mum output.
The text display shows Max mode. The 2-digit dis-
play alternates between the CH flow temperature
– –
and
.
2.3 Stor. tank charge outp
The heat store charging output can be set to any level
between the minimum and maximum rated heat output
for hot water according to the heat transfer capacity of
the heat store.
B Enter the heat store charging output setting on the
commissioning record enclosed with the appliance.
2.4 Anti-cycle mode
This function is only active if service function 2.7 Auto-
matic anti-cycle mode is disabled.
The anti-cycle time is factory set to 3 minutes.
The shortest possible period is 1 minute (recom-
mended for single-pipe and hot-air heating systems).
The setting 0 means that the anti-cycle time is disabled.
If an outside-temperature controlled heat-
i
ing programmer is used, no setting is re-
quired.
The anti-cycle time is optimised by the
programmer.
B Enter the anti-cycle time on the commissioning
record enclosed with the appliance.
2.5 Max. flow temperature
The maximum CH flow temperature can be set to
between 35 °C and 88 °C (factory setting).
2.6 Switch diff. flow NTC
If an outside-temperature controlled heat-
i
ing programmer is used, no setting is re-
quired on the appliance.
The switching difference is the permissible deviation
from the specified CH flow temperature. It can be set in
increments of 1 K. The adjustment range is from 0 to
30 K (factory setting: 0 K). The minimum CH flow tem-
perature is 30 °C.
B Disable anti-cycle time (setting 0).
B The switching difference setting should be entered
on the commissioning record supplied with the appli-
ance.
Boiler service functions
9
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