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Troubleshooting
Fault messages
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.
Faults with on-screen display
Message
Cause
"!T FL"
Failure T-cyl FL sensor
"!T CW"
Failure T CW sensor
"!Flow rate"
Flow sensor failure
"!T DHW"
TDHW sensor failure
"!T DHW max. ex-
Excessive temperature
ceeded"
protection function
"!Pump constantly
Primary pump permanent-
ON"
ly active
"!DHW circ. pump"
DHW circulation pump
failure
Fault messages only with cascade control
"!Prim. circ."
Fault in primary circuit
(primary pump failure)
"!Timeout slave"
VBus failure
Slave not sending a re-
sponse.
32
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.
Affected functions
Modulating set temperature
■
Cold start function
■
Comfort function
■
DHW circ.
■
Heat meter count
■
Thermal pasteurisation
■
DHW heating
■
DHW circ.
■
Thermal pasteurisation
■
Heat meter count
■
DHW heating
■
Cold start function
■
DHW circ.
■
Thermal pasteurisation
■
Heat meter count
■
DHW heating
■
DHW heating
■
Cold start function
■
Comfort function
■
DHW circulation (if DHW circu-
lation pump = active)
DHW heating
■
Cold start function
■
Comfort function
■
Cascade function
Remedy
Check sensor; replace if
necessary.
Automatic restart when
TDHW < TDHW set.
If the fault occurs frequent-
ly, check buffer cylinder
temperature and reduce if
required.
Check primary pump and
replace if required.
Check DHW circulation
pump and replace if re-
quired.
Check primary pump and
replace if required.
Check VBus and replace if
required.
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