6 720 820 872 (2016/12)
CR 400 | CW 400 | CW 800
52 | Troubleshooting
A31
A32
A33
A34
A35
A36
A37
A38
3021
3022
3023
3024
3025
3026
3027
3028
Heating circuit flow temp.
sensor
faulty - standby mode active
(A31/3021
= Heating circuit 1;
A32/3022
= Heating circuit 2;
A33/3023
= Heating circuit 3;
A34/3024
= Heating circuit 4;
A35/3025
= Heating circuit 5;
A36/3026
= Heating circuit 6;
A37/3027
= Heating circuit 7;
A38/3028
= heating circuit 8;
)
Check configuration. The selected setting
requires a flow temperature sensor
Change configuration.
Check the connecting lead between heating
circuit module and flow temperature sensor
Establish a connection properly
Check flow temperature sensor according to
table
If values do not match, replace the
sensor
Check the voltage at the terminals of the flow
temperature sensor at the heating circuit
module according to table
If the sensor values matched, but
the voltage values do not, replace
the heating circuit module
A51
6021 Collector temperature sensor
faulty
Check configuration. The selected setting
requires a 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 Bottom temp. sensor cylinder
1 faulty.
Standby mode active
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 connecting terminals
of the bottom cylinder temperature sensor at
the solar module according to table
If the sensor values matched, but
the voltage values do not match,
replace the module
Fault code
Sub-code Cause or fault description
Test procedure / Cause
Action
Table 25 Fault displays
Summary of Contents for CR 400
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