32
If the system develops faults, the display backlighting
flashes and
"Fault"
will be displayed.
Checking and acknowledging faults
Press the following keys:
1.
"Main menu"
is displayed.
2.
OK to confirm for
"Status"
.
3.
for
"Messages"
.
4.
OK to confirm.
5.
for calling up the fault.
6.
OK to acknowledge.
7.
for calling up further faults (see the following
table).
Note
If an acknowledged fault is not removed, the fault mes-
sage will be re-displayed.
Multiple sensor faults
In this case, only the most recent fault will be dis-
played. This fault must be rectified before the previous
fault is displayed.
Faults with on-screen display
Message
Cause
Affected functions
Remedy
"!T FL"
Failure T-cyl FL sensor
■
Modulating set temperature
■
Cold start function
■
Comfort function
Check sensor; replace if
necessary.
"!T CW"
Failure T CW sensor
■
DHW circ.
■
Heat meter count
■
Thermal pasteurisation
"!Flow rate"
Flow sensor failure
■
DHW heating
■
DHW circ.
■
Thermal pasteurisation
■
Heat meter count
"!T DHW"
TDHW sensor failure
■
DHW heating
■
Cold start function
■
DHW circ.
■
Thermal pasteurisation
■
Heat meter count
"!T DHW max. ex-
ceeded"
Excessive temperature
protection function
■
DHW heating
Automatic restart when
TDHW < TDHW set.
If the fault occurs frequent-
ly, check buffer cylinder
temperature and reduce if
required.
"!Pump constantly
ON"
Primary pump permanent-
ly active
■
DHW heating
■
Cold start function
■
Comfort function
Check primary pump and
replace if required.
"!DHW circ. pump"
DHW circulation pump
failure
DHW circulation (if DHW circu-
lation pump = active)
Check DHW circulation
pump and replace if re-
quired.
Fault messages only with cascade control
"!Prim. circ."
Fault in primary circuit
(primary pump failure)
■
DHW heating
■
Cold start function
■
Comfort function
Check primary pump and
replace if required.
"!Timeout slave"
VBus failure
Slave not sending a re-
sponse.
Cascade function
Check VBus and replace if
required.
Troubleshooting
Fault messages
5517 095 GB
Diagnosis
Summary of Contents for VITOTRANS 353
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