33
Message
Cause
Affected functions
Remedy
"!Timeout master"
VBus failure
Master is not sending a
request.
Cascade function
Check VBus and replace if
required.
"!T FL too low"
Cylinder flow temperature
too low to reach set DHW
temperature.
-
Check buffer cylinder tem-
perature and raise if re-
quired. If the fault occurs
frequently, check the buffer
cylinder design.
"!Valve open"
Cascade valve failure
(valve remains open)
■
Cascade function
■
Load distribution
Check valve, clean, re-
place if required.
"!Valve closed"
Cascade valve failure
(valve remains closed)
■
Cascade function
■
DHW heating
"!Software update!"
Incompatible software ver-
sion (different version)
■
Cascade function
Update software, same
version for all users.
"!Control vers"
Incompatible controller
version (different control-
ler/hydraulics version)
Adjust incorrect hydraulics
version in the factory menu
(for a description, see re-
placement controller in-
structions)
"!Double addr."
Double address assigna-
tion (double cascade mas-
ter or cascade slave)
Assign a different address
to each subscriber.
Information on recommissioning
After a repair, the following occurs automatically:
■
Functions are reactivated
■
Fault message is deleted
■
Cascade is reorganised
*1
"Messages"
"Fault"
Cause
Remedy
!Short circuit
>
Sensor <
The sensor indicated has suffered a short
circuit
Check the relevant sensor (see page 36).
!EEPROM
Internal fault
Switch control unit OFF and after a brief in-
terval back ON again. Check all settings. If
the fault recurs, replace the control unit.
!Processors
!SD card fault
To display the cause, see next chapter.
See the following chapter.
SD fault
Displaying the cause of fault in connection to SD card
"Messages"
Cause
Remedy
!File system
The inserted card is not formatted with the
FAT16 file system.
Format the SD card.
!Incorrect card
Incorrect card type inserted or memory ca-
pacity
>
2 GB.
Never insert SDHC cards.
Insert card with memory capacity
≤
2 GB.
!Write error
Fault while writing to the card
Replace card.
!Write protected
The card is write-protected.
Switch off write protection of the card.
*1
Only with cascade control
Troubleshooting
Fault messages
(cont.)
5517 095 GB
Diagnosis
Summary of Contents for VITOTRANS 353
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