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Fault messages
(cont.)
Displayed fault
System characteristics
code
F.548
Mixer closes. Heating circuit
pump is operational.
F.549
Mixer closes. Heating circuit
pump is operational.
Note
If subscriber faults occur, "Fault, subscriber ..." is dis-
played.
Further messages
Service messages
Message on the display
P.1
P.4
P.8
Status messages
Message on the display
S.60
S.74
S.75
S.94
S.95
S.96
Warning messages
Messages on the
Meaning
display
A.11
System pressure has fallen below normal
limit.
A.12
Real time clock battery flat.
A.18
Possible condensate backup in the heat
cell
Cause
Short circuit, flow temper-
ature sensor for heating
circuit 4 with mixer
Short circuit, flow temper-
ature sensor for heating
circuit 4 with mixer
Meaning
Service due after interval.
Top up heating water.
Service due after burner hours run.
Meaning
Summer mode active (outside temperature economy function)
Heating suppression, heating
DHW circulation pump active
No demand, external hook-up, heating circuit 1
No demand, external hook-up, heating circuit 2
No demand, external hook-up, heating circuit 3
Troubleshooting
Measures
Check flow temperature sensor,
■
mixer 4.
Measure voltage at sensor input
■
on electronics module. Set value:
3.3 V
with sensor disconnected
–
Check commissioning assistant
■
setting.
Checking setting of ADIO rotary
■
switch.
Check flow temperature sensor,
mixer 4.
Measure voltage at sensor input on
electronics module. Set value:
3.3 V
with sensor disconnected
–
Measure
Check system pressure and diaphragm ex-
pansion vessel.
Check settings for set system pressure and
range in the commissioning assistant.
Replace the battery (type CR2032) in the
HMU heat management unit.
Check combustion chamber and conden-
sate drain.
95
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