Unit troubleshooting
19
HPC 410 – 6721832682 (2021/02)
Table 33
Table 34
Table 35
Table 36
Table 37
Table 38
Table 39
Table 40
Table 41
A51 - 6021 - [Solar collector temperature sensor defective]
Test procedure/Cause
Action
Check configuration. The selected
setting requires a solar collector
temperature sensor
Change configuration.
Check connecting lead between
solar module and collector
temperature sensor
Establish a connection properly
Check collector temperature
sensor according to the table
If values do not match, replace the
sensor
Check the voltage at the terminals
of the collector temperature
sensor on the solar module
according to the table
If the sensor values matched, but
the voltage values do not, replace
the solar module
A51 - 6022 - [Cylinder 1 Bottom temp. sensor faulty - heating
standby mode active]
Test procedure/Cause
Action
Check configuration. The selected
setting requires a bottom cylinder
temperature sensor.
Change configuration
Check connecting lead between
solar module and bottom cylinder
temperature sensor
Establish a connection properly
Check the electrical connection of
the connecting lead at the solar
module
If a screw or plug is loose, rectify
the contact problem
Check the bottom cylinder
temperature sensor according to
the table
If values do not match, replace the
sensor
Check the voltage at the terminals
of the bottom cylinder
temperature sensor on the solar
module according to the table
If the sensor values matched, but
the voltage values do not match,
replace the module
A61...A64 – 1081…1084 – [two master control units in the
system] (A61/1081 = heating circuit 1…A64/1084 = heating
circuit 4)
Test procedure/Cause
Action
Check parameter settings at the
installation level
Register room temperature-
dependent controller for heating
circuit 1… 4 as remote control
Hxx - ... - [...]
Test procedure/Cause
Action
For instance, service interval of
heat source elapsed.
Service required; see documents
for the heat source.
A01 - 5378 - [Outdoor unit defrost failure]
Test procedure/Cause
Action
Too low temperature of heating
system.
Open more thermostats on the
heating system.
Defective sensor TL2.
Check sensor TL2 against sensor
tables. Replace sensor TL2 If there
is a deviation.
A01 - 5522 - [Wrong combination of indoor and outdoor units]
Test procedure/Cause
Action
Not matching combination of heat
pump and indoor unit.
Check if the combination is
allowed against combination
tables.
I/O module in the heat pump has
been replaced, but the rotary
encoder is not correctly set.
Check rotary encoder setting on
the old I/O module or in the
electrical wiring diagram.
Installer module in the indoor unit
has been replaced, but the rotary
encoder is not correctly set.
Check rotary encoder setting on
the old installer module or in the
electrical wiring diagram.
H01 - 5594 - [Air in the system]
Test procedure/Cause
Action
Heat carrier flow blocked by a
valve.
Open all valves blocking the flow.
No heat carrier flow due to faulty
primary circulation pump.
Check the primary DHW circulation
pump and replace it if faulty.
Air in the appliance.
Perform purging procedure
according to the installation
instructions of the appliance.
H01 - 5239 - [DHW temp sensor TW1 fault]
Test procedure/Cause
Action
Sensor TW1 / signal cable shorted
or broken.
With the sensor disconnected from
the installer board, measure and
compare the resistance to the
sensor table. Repair cable or
replace sensor if is deviation
found.
Defective installer board.
If the sensor is working correctly
and the warning still triggered,
replace the installer board.
Summary of Contents for HPC 410
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