Bosch HPC 410 Installation Instructions For Contractors page 18

Unit troubleshooting
A01 - 811 - and A41 - 4051...4052 -
[DHW provision: thermal disinfection unsuccessful]
Test procedure/Cause
Using the technical
documentation, check whether
the installed cylinder primary
pump can deliver the required
output
Excessive losses in the DHW
circulation line
Check the hot water temperature
sensor according to table
Check the system configuration.
The output of the electric booster
heater is possibly too small in
relation to the required water
volume
Table 25
A11 - 1000 - [System configuration not confirmed]
Test procedure/Cause
System configuration not
completed
Table 26
A11 - 1010 - [No communication via BUS interface EMS 2]
Test procedure/Cause
Check whether BUS cable was
connected incorrectly
Check whether BUS cable is
defective. Remove expansion
module from BUS and switch
controller off and back on. Check
whether the cause of the fault is a
module or module wiring
Table 27
A11 – 1037 – and A61...A64 – 1037 – [outside temperature sensor
– heating standby mode active] (A61 = heating circuit 1...A64 =
heating circuit 4)
Test procedure/Cause
Check configuration. The selected
setting requires an outside
temperature sensor.
Check the connecting lead
between the control unit and
outside temperature sensor for
continuity
Check the electrical connection of
the connecting lead in the outside
temperature sensor or on the plug
in the control unit
Check outside temperature sensor
according to table
Check the voltage at the
connecting terminals of the
outdoor temperature sensor in the
controller in accordance with table
Table 28
18
Action
Replace the pump if there are
deviations
Check DHW circulation line
Replace the sensor if there are
deviations from the table values
Check/increase the DHW settings
in the service menu >>DHW >>
Maximum duration (60 min
....240 min)
Action
Configure system completely and
confirm
Action
Rectify wiring faults and switch
controller off and on again
• Repair or replace the bus cable
• Replace faulty BUS node
Action
If an outside temperature sensor is
not required, select the room
temperature-dependent
configuration in the controller.
If there is no continuity, rectify the
fault
Clean corroded terminals in the
outside sensor housing.
If values do not match, replace the
sensor
If the sensor values matched, but
the voltage values do not match,
replace the control unit
A11 - 1038 - [Invalid time/date]
Test procedure/Cause
Date/time not yet set
Prolonged loss of power supply
Table 29
A11 - 3061...3064 - [No communication with mixer module (3061
= heating circuit 1...3064 = heating circuit 4)
Test procedure/Cause
Check configuration (set address
at the module). The selected
setting requires a heating circuit
module
Check the BUS connecting lead to
the heating circuit module for
damage. BUS voltage at the
heating circuit module must be
between 12-15 V DC
Heating circuit module defective
Table 30
A11 - 3091...3094 - [Room temperature sensor defective] (3091 =
heating circuit 1...3094 = heating circuit 4)
Test procedure/Cause
• Change the control type of the
heating circuit from room
temperature-dependent to
weather-compensated
• Change frost protection from
room temperature-dependent
to outside temperature-
dependent, if necessary
Table 31
A11 - 6004 - [No communication with solar module]
Test procedure/Cause
Check configuration (set address
at the module). The selected
setting requires a solar module
Check the BUS connecting lead to
the solar module for damage. BUS
voltage at the solar module must
be between 12-15 V DC.
Solar module defective
Table 32
A31...A34 – 3021...3024 – [heating circuit 1... 4 flow temperature
sensor faulty – standby mode active] (A31/3021 = heating circuit
1...A34/3024 = heating circuit 4)
Test procedure/Cause
Check configuration. The selected
setting requires a flow
temperature sensor
Check the connecting lead
between heating circuit module
and flow temperature sensor
Check flow temperature sensor
according to table
Check the voltage at the terminals
of the flow temperature sensor at
the heating circuit module
according to table
Action
Set date/time
Avoid voltage failures
Action
Change configuration
Replace damaged cables
Replace heating circuit module
Action
Replace the system controller or
the remote control.
Action
Change configuration
Replace damaged cables
Replace the module
Action
Change configuration
Establish a connection properly
If values do not match, replace the
sensor
If the sensor values matched, but
the voltage values do not, replace
the heating circuit module
HPC 410 – 6721832682 (2021/02)