6 720 820 872 (2016/12)
CR 400 | CW 400 | CW 800
50 | Troubleshooting
A01
A41
A42
811
4051
4052
DHW heating: thermal
disinfection failed
(A41/4051 = DHW system I;
A42/4052 = DHW system II)
Check if water is possibly being drawn from
the DHW cylinder constantly due to a leak or
taps being open
If water is being drawn constantly,
take action to stop this
Check the position of the hot water
temperature sensor; it may be attached
incorrectly or suspended in the air
Position the hot water temperature
sensor correctly
If the DHW priority was deselected and
heating and DHW are running in parallel, the
boiler output may not be sufficient
Set DHW heating to "priority"
Check whether the heating coil in the cylinder
has been vented completely
Vent if necessary
Check the connection pipes between the heat
source (boiler) and cylinder, and with the aid
of the installation instructions, ensure they
are connected properly
Rectify any faults in the pipework
Using the technical documentation, check
whether the installed cylinder primary pump
can deliver the required output
Replace the pump if there are
deviations
Excessive losses in the DHW circulation line
Check DHW circulation line
Check the hot water temperature sensor
according to table
Replace the sensor if there are
deviations from the table values
A11
1000 System configuration not
confirmed
System configuration not completed
Configure system completely and
confirm
A11
1010 No communication via BUS
connection EMS 2
Check whether BUS cable was connected
incorrectly
Rectify wiring faults and switch
controller off and on again
Check whether BUS cable is defective.
Remove extension module from EMS-BUS and
switch control unit off and back on. Check
whether the cause of the fault is a module or
module wiring
Repair or replace the BUS cable.
Replace the defective EMS-BUS
node
Fault code
Sub-code Cause or fault description
Test procedure / Cause
Action
Table 25 Fault displays
Summary of Contents for CR 400
Page 63: ...6 720 820 872 2016 12 CR 400 CW 400 CW 800 63 Notes ...
Page 64: ......